Pioneer-1

(Earlier)
Pioneer-series spacecraft
(non-planetary: Pioneer-0 — Pioneer-E)

 Pioneer-4 type Pioneer-6/7/8/9 type
Pioneer-0/1/2 typePioneer-3/4 typePioneer-6/7/8/9/E type

This page contains philatelic information on the (earlier) Pioneer-series (non-planetary) spacecraft. Catalog numbers, years of issue, and notes are given when available. If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page.

The first part of the Pioneer series, Pioneer-0 — Pioneer-E [which failed], were primarily lunar, solar, and inter-planetary-exploration spacecraft. Only these (earlier) Pioneer (non-planetary) spacecraft are included here. The second part of the series, Pioneer-10 — Pioneer-13, were for exploration of the planets, including specific missions of two Pioneers to Jupiter/Saturn and two Pioneers to Venus. Those (later) Pioneer (planetary) spacecraft are covered elsewhere.

Launch information
(found elsewhere)		 Reference images
(found elsewhere)		 Launch covers
(including anniversary-of-launch covers, and launch-related event covers)
(farther below or elsewhere)		 Other postal items
(stamps, souvenir sheets, aerogrammes, postal cards, etc.)
(immediately below or elsewhere)
(Earlier) Pioneer
(non-planetary) 		(Earlier) Pioneer
(non-planetary) 		(Earlier) Pioneer
(non-planetary) 		(Earlier) Pioneer
(non-planetary)
(Earlier) Pioneer (on other than Pioneer-0/E launch covers)
(Later) Pioneer
(planetary) 		(Later) Pioneer
(planetary) 		(Later) Pioneer
(planetary) 		(Later) Pioneer
(planetary)

Below is a list of (earlier) Pioneer-series (non-planetary) spacecraft postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.).

CountryCatalog NumberType of ItemYear of IssueNotes on Content
(Earlier) Pioneer (non-planetary)
BelgiumNoneIn (lower-middle and lower-right) margins of imperforate MS2 cinderella1963?Pioneer-0/1/2 type4 (in lower-middle margin); Pioneer-51 (in lower-right margin)
Bhutan406 (BL100)
i406		SS1
Imperforate SS1		1984Pioneer-51
Bhutan407 (BL101)
i407		In (upper-right) margin of SS1
In (upper-right) margin of imperforate SS1
Burundi133 (Mi174A)
i133 (Mi174B)
Imperforate		1965Pioneer-51
Burundi126+128-129+133 fdcOne of four stamps on FDC
Burundii126-i127+i131+i133 fdcOne of four imperforate stamps on FDC
Burundi133a (BL7A)
i133a (BL7B)		One stamp and in (center) margin of MS2 (131+133)
One stamp and in (center) margin of imperforate MS2 (i131+i133)
CamerounC84 (Mi502)
iC84
Imperforate		1967Pioneer-6/7/8/9 type3 ("Pioneer-A" (Pioneer-6), with folded antennas, launch date for Pioneer-1)
Central African RepublicBL574A
BL574B		In (right) margin of SS1, gold foil
In (right) margin of imperforate SS1, gold foil		1995"Pioneer-1" launch, "Pioneer-5"
Congo RepublicUnknown ss (BL none)In (lower-left) margin of SS1 [known illegal issue]2016"Pioneer-7"
Cuba1800 (Mi1875)1973Pioneer-3/4 type3
DjiboutiUnknown a (Mi none)
Unknown ia		One of MS9 (a-i) [known illegal issue]
One of imperforate MS9 (a-i)		2010"Pioneer-5"
DjiboutiUnknown proofSigned-proof imperforate MS9
East SiberiaLocalImage of unknown origin overprinted on 4x Russia 45192 (Mi4496), from strip of 5, also overprint template1996Pioneer-51
East SiberiaLocalImage of unknown origin overprinted on 4x Russia 5984 (Mi6177), from strip of 5, also overprint template
East SiberiaLocalImage of unknown origin overprinted on 4x Russia 6066A (Mi262), from strip of 5, also overprint template
East SiberiaLocalImage of unknown origin overprinted on 4x Russia 6067A (Mi252), from strip of 5, also overprint template
Franklin Mint (USA)None(Bronze) medallion, also reverse1970s"Pioneer-5"
Franklin Mint (USA)None(Silver) medallion, also reverse"Pioneer-5"
FujeiraMi70A
Mi70B
Imperforate		1966Pioneer-51
FujeiraMi70A-77A fdcOne of eight stamps on FDC
FujeiraMi149A
Mi149B		Mi70A overprinted new currency
Mi70B overprinted new currency		1967Pioneer-51
FujeiraMi348A
Mi348B		Mi70A overprinted "Apollo-8"
Mi70B overprinted "Apollo-8"		1969Pioneer-51
FujeiraMi341A-348A fdcOne of eight stamps on FDC
Gambia3148 (Mi5955-5957)
i3148		MS6 (3148 (2x (a-c))), also strip of 3 detail
Imperforate MS6 (i3148 (2x (a-c)))		2008"Pioneer-1"
Gambia3148 fdcMS6 on FDC
Gambia3149 (Mi5958-5960)
i3149		MS6 (3149 (2x (a-c))), also strip of 3 detail
Imperforate MS6 (i3149 (2x (a-c)))		"Pioneer-3"
Gambia3149 fdcMS6 on FDC
Gambia3150 (Mi5961-5962)
i3150		MS4 (3150 (2x (a-b))), also strip of 2 detail
Imperforate MS4 (i3150 (2x (a-b)))		"Pioneer-1"
Gambia3150 fdc
i3150 fdc		MS4 on FDC
Imperforate MS4 on FDC
Gambia3151 (Mi5963-5964)
i3151		MS4 (3151 (2x (a-b))), also strip of 2 detail
Imperforate MS4 (i3151 (2x (a-b)))		"Pioneer-3"
Gambia3151 fdcMS4 on FDC
Gambia3152 (BL768)
i3152		SS1
Imperforate SS1		"Pioneer-1"
Gambia3152 fdc
i3152 fdc		SS1 on FDC
Imperforate SS1 on FDC
Gambia3153 (BL769)
i3153		SS1
Imperforate SS1		"Pioneer-3"
Gambia3153 fdc
i3153 fdc		SS1 on FDC
Imperforate SS1 on FDC
Germany (West)NoneCinderella (poster stamp), from MS30 cinderella~1966"Pioneer-4"
Germany (West)None"Pioneer-5"
Ghana164 (Mi170A)
i164 (Mi170B)
Imperforate		1964Pioneer-0/1/2 type4
Ghana165 (Mi171A)
i165 (Mi171B)
Imperforate
Ghana166 (Mi172A)
i166 (Mi172B)
Imperforate
Ghana164-166 fdcThree stamps on FDC
Ghana166a (BL9)On all four stamps and in (left and lower-right) margin of imperforate MS4 (4x 166)Pioneer-0/1/2 type4 (on stamps and in left margin), Pioneer-51 (in lower-right margin)
Ghana166a fdcImperforate MS4 on FDC
Ghana186 (Mi185A)
i186 (Mi185B)		From MS12 (186a (12x 186))
From imperforate MS12 (i186a (12x i186))		1964Pioneer-0/1/2 type4
Ghana187 (Mi186A)
i187 (Mi186B)		From MS12 (187a (12x 187))
From imperforate MS12 (i187a (12x i187))
Ghana188 (Mi187A)
i188 (Mi187B)		From MS12 (188a (12x 188))
From imperforate MS12 (i188a (12x i188))
Great Britain2317_ms10 folder (Mi2341_ms10 folder)Folder front with MS10 (2317_ms10 (10x 2317 + 10 labels)), also back2009"NASA's Pioneer and Surveyor probes"
Guinea RepublicMi5312Stamp from SS1 (BL1476)2007"Pioneer-S" (in text, but Pioneer-5 depicted)1
Guinea RepublicBL1476 fdcSS1 on FDC
Guyana2876 (BL441)
i2876		On stamp of SS1
On stamp of imperforate SS1		1994"Pioneer-1 and 2" (but Pioneer-10/11 type)
Haitim1310 (Mi unlisted) (Yv723)
im1310
Imperforate		1973Pioneer-6/7/8/9 type3 (with folded antennas)
Haitim1310 proof1Proof
Haitim1310 proof2Proof (different)
Haitim1310 proof3Proof (different)
Haitim1310 proof4Proof (different)
Haitim1310 proof5Proof (different)
Haitim1310 proof6Proof (different)
Haitim1310 proof7Proof (different)
Haitim1369 (Mi unlisted)
im1369		m1310 overprinted
im1310 overprinted		1974Pioneer-6/7/8/9 type3 (with folded antennas)
Haitim1368-m1379 fdcOne of 12 stamps on FDC
Korea (North)3663 (Mi3963)In (upper-right) margin of MS6 (3663 (a-e))1997Pioneer-P1/3/30/31 type
Macau470 fdc (Mi498 fdc)(Black printed) cachet on FDC1983Pioneer-51
MaliUnknown d (Mi none)One of MS4 (a-d) [known illegal issue]2018"Pioneer-4"
MaliUnknown ms fdc
Unknown ims fdc		MS4 on FDC
Imperforate MS4 and (multi-color printed) cachet on FDC
MaliUnknown c (Mi none)One of MS4 (a-b) [known illegal issue]2018"Pioneer-5" (and launch date)
MaliUnknown ims fdcImperforate MS4 on FDC
Micronesia989 (Mi2361-2364)In (left) margin of MS4 (989 (a-d))2012Pioneer-4
Micronesia990 (Mi2365-2368)In (left) margin of MS4 (990 (a-d))Pioneer-0
MongoliaC6 (Mi382)1965Pioneer-51
Mongolia371+373-374+C6 fdc1One of four stamps on FDC
Mongolia371+373-374+C6 fdc2One of four stamps on FDC (no cancel)
Montserrat891 (BL73)In (upper) margin of SS11996Pioneer-51
Nigeria143a (Mi134)
i143a		In (lower-left) margin of MS12 (12x 143)
In (lower-left) margin of "imperforate"5 MS12 (12x 143)		1963Pioneer-0/1/2 type4
Nigeria144a (Mi135)
i144a		In (lower-left) margin of MS12 (12x 144)
In (lower-left) margin of "imperforate"5 MS12 (12x 144)
PanamaC334a (BL36)
iC334a (BL37)		In (lower) margin of MS2 (C333-C334)
In (lower) margin of imperforate MS2 (iC333-iC334), changed colors		1965Pioneer-0/1/2 type4
PanamaC336a (BL38)
iC336a (BL39)		In (lower-left) margin of MS2 (C335-C336)
In (lower-left) margin of imperforate MS2 (iC335-iC336), changed colors
Paraguay922 (Mi1522)
i922 (Mi1530)
Imperforate with changed colors		1966Pioneer-0/1/2 type4
Paraguay919-923 fdcOne of five stamps on FDC
Paraguay926 (Mi1526)
i926 (Mi1534)
Imperforate with changed colors
Paraguay926a (BL79)
i926a (BL80)		On stamp of SS1
On stamp of imperforate SS1, changed colors
Paraguay926a fdc
i926a fdc		SS1 and (red and black printed) cachet on FDC
Imperforate SS1 and (red and black printed) cachet on FDC
Qatar448 (Mi655)1975Pioneer-51
Rwanda136 (BL5A)
i136 (BL5B)		In (lower-middle and lower-left) margin of MS2 (136 (a-b))
In (lower-middle and lower-left) margin of imperforate MS2 (i136 (a-b))		1965Pioneer-0/1/2 type4 (in lower-middle margin), Pioneer-51 (in lower-left margin)
St. Thomas and Prince Islands906 (BL221)In (extreme upper-right) margin of SS11989(poorly-depicted) Pioneer-5/Explorer-61
Sharjah44 (Mi56A)
i44 (Mi56B)
Imperforate		1964"Pioneer-5"1
Sharjah48A (BL4)Imperforate SS1
Sharjah44_op (Mi56A_op)
i44A		44 overprinted new currency
i44 overprinted new currency		1967"Pioneer-5"1
SharjahMi1000A
Mi1000B
Imperforate		1972Pioneer-3/4 type3
SharjahMi1000 dsDeluxe sheet (Mi1000)
United Nations112-113 fdc (Mi122-123 fdc)(Orbit Covers) cachet on FDC1962"Pioneer-V" (Pioneer-5)
United StatesNone(Astro Covers) cachet on cover1962"Pioneer"
United States
United Nations		1193 cover
112 cover		(Orbit Covers) cachet on cover1963"Pioneer"
United StatesC76 fdc (Mi990 fdc)(Centennial yellow earth) cachet on FDC1969Pioneer-3/4 type3
United StatesNone(Rockpex) cachet (with design similar to Centennial black rocket, type-1) cachet) on cover1971Pioneer-3/4 type2, Pioneer-5/Explorer-61
United States1556 fdc1 (Mi1164 fdc1)(Orbit Covers) cachet on FDC1975Pioneer-0/1/2 type, Pioneer-3/4 type2, Pioneer-5 and Pioneer-6/7/8/9 type (on cachet); "Pioneer-1" - "Pioneer-11"; (also depiction of Pioneer-10/11 type)
United States1556 fdc2 (Mi1164 fdc2)(David 'C' Cachets) cachet on FDCPioneer-5
United States1759 fdc
1710 cover		(Aeropex'77) cachet on FDC, also annotated1978
1977		"Pioneer"
United States1916 fdc (Mi1485 fdc)(PCS golden-replica) insert from FDC, also front1981"Pioneer-5"
United States3187d fdc (Mi3126 fdc)(Artmaster) back of FDC, also front1999"Pioneer-4"
Vanuatu1123c (Mi1601)One of MS6 (1123 (a-f)) (BL81, Mi1599-1604)2021Pioneer-5 mockup at the Smithsonian National Air and Space Museum (design based on this photo)
Yemen Arab Republic261 (Mi921)
261g (Mi928)
Imperforate with changed colors		1969"Pionneer-4", "Pionneer-5"1 (but Pioneer mis-spelled, with 2 n's in text); (also Pioneer-5 launch date is given as "11.3.1959", whereas the correct year was 1960)
Yemen Arab RepublicC90ae (Mi1706)One of MS4 (C90a (b-e)) (BL218)1982Pioneer-5/Explorer-61
Yemen Arab RepublicC90ae proofChromalin proof
Yugoslavia1045-1047 fdc (Mi1409-1411 fdc)(Green and black printed) cachet on FDC1971Pioneer-0/1/2 type4 (but "Kosmos" in text)
Yugoslavia1048-1050 fdc1 (Mi1412-1414 fdc1)(Red-brown and black printed) cachet on FDC
Yugoslavia1048-1050 fdc2 (Mi1412-1414 fdc2)(Green and black printed) cachet on FDC

1Pioneer-5 and Explorer-6 were similar "paddlewheel" satellites. It is believed that Explorer-6 contained two short antennas on its "top", whereas Pioneer-5 contained only a single short antenna. When there are no antennas on top, the distinction is unclear, but of the two, Pioneer-5 is assumed.
2Pioneer-3 and 4 are basically identical.
3Pioneer-6, 7, 8, and 9 are all basically identical.
4Pioneer-0, 1, and 2 are all basically identical.
5The "imperforate" sheets from Nigeria, i143a and i144a, are imperforate only in the surrounding margins, otherwise the stamps in both sheets are perforated on all sides.

Below is a list of (earlier) Pioneer-series (non-planetary) satellite launch covers (including anniversary-of-launch covers, and launch-related event covers).

CountryCancel DateCancel LocationType of ItemNotes on Content
(Earlier) Pioneer (non-planetary)
1958-10-11: Pioneer-1
United States1958-10-11Port Canaveral FL(Goldcraft Cachets) cachet on coverPioneer-1 launch
United States1958-10-11Patrick AFB, FL(Goldcraft) cachet on coverPioneer-1 launch
United States1958-10-11Port Canaveral FL(Sarzin) cachet on coverPioneer-1 launch
United States1958-10-11Patrick AFB, FL(HF) cachet on coverPioneer-1 launch
Pioneer-1 (anniversaries)
United States1978-10-11Moffett Field CA(NASA Ames Research Center) cachet on cover20th anniv. Pioneer-1 launch
1958-11-08: Pioneer-2 [failed]
United States1958-11-08Port Canaveral FL(Goldcraft Cachets) cachet on coverPioneer-2 launch [failed]
1958-12-06: Pioneer-3
United States1958-12-06Port Canaveral FL(Goldcraft Cachets) cachet on coverPioneer-3 launch
United States1958-12-06Cocoa Beach FL(Blue and black sticker) cachet on coverPioneer-3 launch
1959-03-03: Pioneer-4
United States1959-03-03Port Canaveral FL(Goldcraft Cachets) cachet on coverPioneer-4 launch
United States1959-03-03Patrick AFB, FL(Jim Fitzpatrick) cachet on coverPioneer-4 launch
United States1959-03-03Patrick AFB, FL(H. Flick) cachet on coverPioneer-4 launch
United States1959-03-03Patrick AFB, FL(H. Flick) cachet on (airmail) coverPioneer-4 launch
United States1959-03-03Patrick AFB, FL(HF, no logo) cachet on cover, also backPioneer-4 launch
United States1959-03-03Orsino FL(Black printed) cachet on coverPioneer-4 launch
Pioneer-4 (anniversaries)
United States1999-03-03Kennedy Space Center FL(Multi-color printed) cachet on cover40th anniv. Pioneer-4 launch
1959-11-26: Pioneer-P3 [failed]
United States1959-11-26Port Canaveral FL(Goldcraft Cachets) cachet on coverPioneer-P3 launch [failed]
1960-03-11: Pioneer-51
United States1960-03-11Patrick AFB, FL(Black printed and black typed) cachet on coverPioneer-5 launch
United States1960-03-11Port Canaveral FL(Goldcraft) cachet on coverPioneer-5 launch
United States1960-03-11Port Canaveral FL(Black typed and hand-printed) cachet on coverPioneer-5 launch
United States1960-03-11Port Canaveral FL(Sarzin) cachet on coverPioneer-5 launch
United States1960-03-11Port Canaveral FL(Red and blue rubber-stamp) cachet on coverPioneer-5 launch
United States1960-03-11Port Canaveral FL(Sarzin) cachet on coverPioneer-5 launch
United States1960-03-11Cleveland OH(Black printed) cachet on coverPioneer-5 launch
United States1960-03-11Patrick AFB, FL(Swanson blue rubber-stamp) cachet on coverPioneer-5 launch
United States1960-03-11Patrick AFB, FL(Swanson magenta rubber-stamp) cachet on (airmail) coverPioneer-5 launch
1960-09-25: Pioneer-P30 [failed]
United States1960-09-25Port Canaveral FL(Goldcraft Cachets) cachet on coverPioneer-P30 launch [failed] (not "Pioneer-VI" as in text)
1960-12-15: Pioneer-P31 [failed]
United States1960-12-15?Patrick AFB, FL(Swanson red and purple rubber-stamp) cachet on coverPioneer-P31 launch [failed]
United States1960-12-15Port Canaveral FL(Goldcraft Cachets) cachet on coverPioneer-P31 launch [failed]
United States1960-12-16Patrick AFB, FL(Jim Fitzpatrick purple and black and magenta rubber-stamp) cachet on coverPioneer-P31 launch [failed]
1965-12-16: Pioneer-6
United States1965-12-16Cape Canaveral FL(DuBeau? blue and black rubber-stamp) cachet on coverPioneer-6 launch
United States1965-12-16Cape Canaveral FL(SpaceCraft/Swanson) cachet on cover, also insertPioneer-6 launch
United States1965-12-16Patrick AFB, FL(SpaceCraft/Swanson) cachet on cover, also insertPioneer-6 launch
United States1965-12-16Cape Canaveral FL(Sarzin) cachet on coverPioneer-6 launch
United States1965-12-16Cape Canaveral FL(Celestial) cachet on coverPioneer-6 launch (but Pioneer-51 depicted)
United States1965-12-16Cape Canaveral FL (machine cancel)(Centennial) cachet on coverPioneer-6 launch
United States1965-12-16Cape Canaveral FL (hand cancel)(Centennial) cachet on coverPioneer-6 launch
Pioneer-6 (anniversaries)
United States1980-12-16Moffett Field CA(NASA Ames Research Center) cachet on cover15th anniv. Pioneer-6 launch
1966-08-17: Pioneer-7
United States1966-08-17Cape Canaveral FL(Orbit Covers) cachet on coverPioneer-7 launch
United States1966-08-17Patrick AFB, FL(SpaceCraft/Swanson) cachet on cover, also insertPioneer-7 launch
United States1966-08-17Cape Canaveral FL(SpaceCraft/Swanson) cachet on cover, also insertPioneer-7 launch
United States1966-08-17Cape Canaveral FL(Swanson purple rubber-stamp) cachet (and signature) on coverPioneer-7 launch
United States1966-08-17Cape Canaveral FL(Astro Covers, no logo) cachet on coverPioneer-7 launch
United States1966-08-17Kennedy Space Center FL(Astro Covers, no logo) cachet on coverPioneer-7 launch
United States1966-08-17Kennedy Space Center FL(Astro Covers, no logo) cachet (slightly different) on coverPioneer-7 launch (mis-spelled "Pioneeer-7" in text)
United States1966-08-17Patrick AFB, FL(Sarzin) cachet on coverPioneer-7 launch
United States1966-08-17Cape Canaveral FL(Blue rubber-stamp) cachet on coverPioneer-7 launch
United States1966-08-17Cape Canaveral FL(Centennial black rocket, type-1) cachet on coverPioneer-7 launch (but Pioneer-3/4 type3, Pioneer-5/Explorer-61, and Vanguard-2 depicted)
United States1966-08-17Cape Canaveral FL(Centennial grey rocket, type-1) cachet on coverPioneer-7 launch (but Pioneer-3/4 type3, Pioneer-5/Explorer-61, and Vanguard-2 depicted)
United States1966-08-17Cape Canaveral FL(HJM black and black typed) cachet on coverPioneer-7 launch (Explorer-10, Mariner-1/2 type, and Syncom depicted)
1967-12-13: Pioneer-8 (and TETR-1)
United States1967-12-13Patrick AFB, FL (hand cancel)(SpaceCraft/Swanson) cachet on cover, also insertPioneer-8 launch; Pioneer-7 (on insert)
United States1967-12-13Patrick AFB, FL (machine cancel)(SpaceCraft/Swanson) cachet on cover, also insertPioneer-8 launch; Pioneer-7 (on insert)
United States1967-12-13Cape Canaveral FL (hand cancel)(SpaceCraft/Swanson) cachet on cover, also insertPioneer-8 launch; Pioneer-7 (on insert)
United States1967-12-13Cape Canaveral FL (machine cancel)(SpaceCraft/Swanson) cachet on cover, also insertPioneer-8 launch; Pioneer-7 (on insert)
United States1967-12-13Cape Canaveral FL (machine cancel)(Orbit Covers, no logo) cachet on coverPioneer-8 launch
United States1967-12-13Cape Canaveral FL (hand cancel)(Orbit Covers, no logo) cachet on coverPioneer-8 launch
United States1967-12-13Kennedy Space Center FL(Centennial) cachet on coverPioneer-8 launch
United States1967-12-13Cape Canaveral FL(Centennial) cachet on coverPioneer-8 launch
United States1967-12-13Cape Canaveral FL (hand and machine cancels)(Centennial-like) cachet on coverPioneer-8 launch
United States1967-12-13Kennedy Space Center FL(Centennial-like) cachet on coverPioneer-8 launch
United States1967-12-13Cape Canaveral FL(Sarzin) cachet on coverPioneer-8 launch (but Ranger-3/4/5 type depicted)
United States1967-12-13Kennedy Space Center FL(DuBeau? red-brown rubber-stamp) cachet on coverPioneer-8 launch
United States1967-12-13Kennedy Space Center FL(R. DuBeau) cachet on coverPioneer-8 launch
United States1967-12-13Cape Canaveral FL(Swanson/DuBeau? magenta rubber-stamp) cachet on coverPioneer-8 launch
1968-11-08: Pioneer-9 (and TETR-2)
United States1968-11-08Patrick AFB, FL (machine cancel)(SpaceCraft/Swanson) cachet on cover, also insert1, insert1 back, and insert2Pioneer-9 launch; "Pioneer-6", "Pioneer-7", and "Pioneer-8" (on insert1 back)
United States1968-11-08Patrick AFB, FL (hand cancel)(SpaceCraft/Swanson) cachet on cover, also insert1, insert1 back, and insert2Pioneer-9 launch; "Pioneer-6", "Pioneer-7", and "Pioneer-8" (on insert1 back)
United States1968-11-08Cape Canaveral FL (machine cancel)(SpaceCraft/Swanson) cachet on cover, also insert1, insert1 back, and insert2Pioneer-9 launch; "Pioneer-6", "Pioneer-7", and "Pioneer-8" (on insert1 back)
United States1968-11-08Cape Canaveral FL (hand cancel)(SpaceCraft/Swanson) cachet on cover, also insert1, insert1 back, and insert2Pioneer-9 launch; "Pioneer-6", "Pioneer-7", and "Pioneer-8" (on insert1 back)
United States1968-11-08Kennedy Space Center FL(SpaceCraft/Swanson) cachet on cover, also insert1, insert1 back, and insert2Pioneer-9 launch; "Pioneer-6", "Pioneer-7", and "Pioneer-8" (on insert1 back)
United States1968-11-08Cape Canaveral FL(Sarzin) cachet on coverPioneer-9 launch
United States1968-11-08Cape Canaveral FL(Whitney purple and cyan) cachet on coverPioneer-9 launch
United States1968-11-08Kennedy Space Center FL(R. DuBeau blue rubber-stamp) cachet on coverPioneer-9 launch
United States1968-11-08Cape Canaveral FL(Orbit Covers) cachet on coverPioneer-9 launch
United States1968-11-08Cape Canaveral FL(Orbit Covers and red rubber-stamp) cachet on coverPioneer-9 launch
United States1968-11-08Cape Canaveral FL(Centennial black and blue) cachet on coverPioneer-9 launch
United States1968-11-08Cape Canaveral FL(Centennial black) cachet on coverPioneer-9 launch
United States1968-11-08Cape Canaveral FL(Centennial) cachet (different) on coverPioneer-9 launch
United States1968-11-08Cape Canaveral FL(Centennial-like) cachet on coverPioneer-9 launch
United States1968-11-08Cape Canaveral FL(Blue printed) cachet on coverPioneer-9 launch
United States1968-11-08Cape Canaveral FL(Swanson/DuBeau? magenta rubber-stamp) cachet on coverPioneer-9 launch (not "Pioneer-6", as in text)
United States1968-11-08Cape Canaveral FL(Sokalsky purple and black typed) cachet on coverPioneer-9 launch (not "Pioneer-6", as in text)
1969-08-27: Pioneer-E (and TETR-3) [failed]
United States1969-08-27Cape Canaveral FL (machine cancel)(SpaceCraft/Swanson) cachet on cover, also insertPioneer-E launch [failed] (not "Pioneer-10", as in text)
United States1969-08-27Cape Canaveral FL (hand cancel)(SpaceCraft/Swanson) cachet on cover, also insertPioneer-E launch [failed] (not "Pioneer-10", as in text)
United States1969-08-27Patrick AFB, FL(SpaceCraft/Swanson) cachet on cover, also insertPioneer-E launch [failed] (not "Pioneer-10", as in text)
United States1969-08-27Kennedy Space Center FL(SpaceCraft/Swanson) cachet on cover, also insertPioneer-E launch [failed] (not "Pioneer-10", as in text)
United States1969-08-27Cape Canaveral FL(C. Swanson magenta rubber-stanmp) cachet on coverPioneer-E launch [failed] (not "Pioneer-10", as in text)
United States1969-08-27Cape Canaveral FL(Whitney blue and red and black) cachet on coverPioneer-E launch [failed] (not "Pioneer-10", as in text)
United States1969-08-27Patrick AFB, FL(Whitney blue and red and black) cachet on coverPioneer-E launch [failed] (not "Pioneer-10", as in text)
United States1969-08-27Colorado Springs CO(R.E. Nichol?) cachet on coverPioneer-E launch [failed] (not "Pioneer-10", as in text)
United States1969-08-27Cape Canaveral FL(Centennial-like yellow earth) cachet on coverPioneer-E launch [failed] (not "Pioneer-10", as in text); (but Relay, Vanguard-2, Pioneer-3/4 type3, Explorer-1, TIROS/ESSA type depicted)
United States1969-08-27Cape Canaveral FL(Centennial-like) cachet on coverPioneer-E launch [failed] (not "Pioneer-10", as in text)
United States1969-08-28Cape Canaveral FL(Centennial yellow earth) cachet on coverPioneer-E launch [failed] (not "Pioneer-10", as in text); (but Relay, Vanguard-2, Pioneer-3/4 type3, Explorer-1, TIROS/ESSA type depicted)
United States1969-08-28Cape Canaveral FL(Centennial-like) cachet on coverPioneer-E launch [failed]
United States1969-08-28Cape Canaveral FL(Centennial-like red rocket, type-2) cachet on coverPioneer-E launch [failed] (but Transit-2A, Pioneer-5/Explorer-61, TIROS/ESSA type, and Vanguard-2 depicted)
(Earlier) Pioneer (on other than Pioneer-0/E launch covers)
There exist a large number of Centennial Covers with generic cachets with multiple satellites depicted, including Pioneer-3/4 type3 and Pioneer-5/Explorer-61. Details about these cachets, as well as images of the covers, are found in the Centennial Covers page.
United States1959-11-20Vandenberg AFB, CA(Goldcraft Cachets) cachet on Discoverer-8 launch coverPioneer-51
United States1960-04-15Vandenberg AFB, CA(Goldcraft Cachets blue) cachet on Discoverer-11 launch coverPioneer-51
United States1960-04-15Vandenberg AFB, CA(Goldcraft Cachets black) cachet on Discoverer-11 launch cover
United States1960-12-07Vandenberg AFB, CA(Goldcraft Cachets) cachet on Discoverer-18 launch coverPioneer-51
United States1961-08-15Port Canaveral FL(Sarzin) cachet on Explorer-12 launch coverPioneer-51
United States1964-07-27Houston TX(TD Productions/HJM-like) cachet on Gemini-4 pre-launch cover, also annotated(poorly-depicted) "Pioneer"-6/7/8/9 type
United States1964-12-21Cape Canaveral FL(Goldcraft Cachets and red rubber-stamp) cachet on Explorer-26 coverPioneer-51
United States1965-07-24Cape Canaveral FL(Brown printed) cachet on (sub-orbital) rocket launch cover, also annotatedPioneer-51
United States1967-05-29Vandenberg AFB, CA(SpaceCraft/Swanson) insert1 from ESRO-2A launch cover (with ESRO logo in low position), also front and insert2 front and insert2 back"U.S. Pioneer"
United States1967-05-29Vandenberg AFB, CA(SpaceCraft/Swanson) insert1 from ESRO-2A launch cover (with ESRO logo in high position), also front and insert2 front and insert2 back
United States1973-10-26Cape Canaveral FL(Orbit Covers) cachet on Explorer-50 launch cover"Pioneer"
United States2019-10-12Sagamore Beach MA(Coverscape) cachet on Explorer-7 anniversary cover"Pioneer-4"

1Pioneer-5 and Explorer-6 were similar "paddlewheel" spacecraft. It is believed that Explorer-6 contained two short antennas on its "top", whereas Pioneer-5 contained only a single short antenna. When there are no antennas on top, the distinction is unclear, but of the two, Pioneer-5 is assumed.
2Pioneer-0, 1, and 2 are all basically identical.
3Pioneer-3 and 4 are basically identical.

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