1991 Stamp Issues
The Year 1991's Issues: | Issue Date | Set ID | Issue Name | | January 6, 1991
| W18 | Roosevelt's Four Freedoms Speech, 1941 | | February 5, 1991 | W19 | Battle of Beda Fomm,
1941 | | April 6, 1991 | W20 |
Germany Invades the Balkans, 1941 | | April 12, 1991 | C54 |
10 Years of Space Shuttle Flights, 1981-1991 | | April 12, 1991 | P3 | U.S. Space Shuttle Flights 1981-1991: Official Coin First Day Cover |
| May 27, 1991 | W21 | Sinking of
the Bismarck, 1941 | | June 10, 1991 | C53 | Flowers of the Marshall Islands: Orchids | | June 10, 1991 | C53A |
International Stamp Exhibition, Phila Nippon '91 Tokyo | | June
22, 1991 | W22 | German Invasion of Russia, 1941 | | July 4, 1991 | C55 | To the Heroes of Desert
Storm | | July 4, 1991 | P4 |
Heroes of Desert Storm: Official Coin First Day Cover | | July 16, 1991 | B20 | Birds of the Atolls and Reefs | | August 14, 1991 | W23 | Atlantic Charter, 1941 | |
September 10, 1991 | C56 | Air Marshall Islands |
| September 24, 1991 | C57 |
Admission of Marshall Islands to United Nations | | October 2, 1991 | W24 |
Siege of Moscow, 1941 | | October 25, 1991 | C58
| Christmas (Kurijmoj), 1991: Peace and Joy | | October 31,
1991 | W25 | Sinking of the USS Reuben James, 1941 |
| November 26, 1991 | C59 | 25 Years of Peace
Corps in Marshall Islands | | December 7, 1991 | P5 | Heroes of Pearl Harbor: Official Coin First Day Cover | | December 7, 1991 | W26 | Attack on Pearl Harbor, 1941 | |
December 10, 1991 | W27 | Japanese Capture Guam, 1941 |
| December 10, 1991 | W28 |
Fall of Singapore, 1941 | | December 20, 1991 | W29 | First Combat by the Flying Tigers, 1941 | | December 23, 1991 |
W30 | Fall of Wake Island, 1941 | |
