现在展示: 美国 - (通用)邮票 (1847 - 2015) - 5842 邮票.
20. 四月 窗口管理器: 空缺 设计: H. T. Wybrandi - Raue. 雕版: Bureau of Engraving & Printing. 筛孔: 11
![[The 200th Anniversary of Diplomatic Relations between USA & The Netherlands, 类型 BBN]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/BBN-s.jpg)
21. 四月 窗口管理器: 空缺 设计: Bradbury Thompson. 雕版: Bureau of Engraving & Printing. 筛孔: 11
![[Library of Congress, 类型 BBO]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/BBO-s.jpg)
27. 四月 窗口管理器: 空缺 设计: A. Saavedra, J. Boyd y J. Creamer. 雕版: Bureau of Engraving & Printing. 筛孔: 10 vertical
![[Consumer Education - Coil stamp, 类型 BBP]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/BBP-s.jpg)