現在展示： 美國 - （通用）郵票 (1847 - 2017) - 6084 郵票.
20. April 窗口管理器: 空缺 設計: H. T. Wybrandi - Raue. 雕版: Bureau of Engraving & Printing. 篩孔: 11
![[The 200th Anniversary of Diplomatic Relations between USA & The Netherlands, 類型 BBN]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/BBN-s.jpg)
21. April 窗口管理器: 空缺 設計: Bradbury Thompson. 雕版: Bureau of Engraving & Printing. 篩孔: 11
![[Library of Congress, 類型 BBO]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/BBO-s.jpg)
27. April 窗口管理器: 空缺 設計: A. Saavedra, J. Boyd y J. Creamer. 雕版: Bureau of Engraving & Printing. 篩孔: 10 vertical
![[Consumer Education - Coil stamp, 類型 BBP]](https://www.stampworld.com/media/catalogue/United-States/Postage-stamps/BBP-s.jpg)
