現在展示： 美國 - （通用）郵票 (1940 - 1949) - 5 郵票.
10. May 窗口管理器: 空缺 篩孔: 11 x 10½
![[Transcontinental Railroad, 類型 OM]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/OM-s.jpg)
22. May 窗口管理器: 空缺 篩孔: 11 x 10½
![[The 125th Anniversary of the First Steamship Crossing the Atlantic, 類型 ON]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/ON-s.jpg)
24. May 窗口管理器: 空缺 篩孔: 11 x 10½
![[The 100th Anniversary of the First Telegraph Transmitted Message, 類型 OO]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/OO-s.jpg)
27. September 窗口管理器: 空缺 篩孔: 11 x 10½
![[Corregidor Island, 類型 OP]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/OP-s.jpg)
31. October 窗口管理器: 空缺 篩孔: 11 x 10½
![[The 50th Anniversary of Motion Pictures, 類型 OQ]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/OQ-s.jpg)
