現在展示： 新加坡 - 欠資郵票 (1970 - 1979) - 2 郵票.
1973
Postage Due Stamps - Different Perforation
27. March 窗口管理器: 1 篩孔: 13½
![[Postage Due Stamps - Different Perforation, 類型 A8]](https://www.stampworld.com/media/catalogue/Singapore/Postage-due-stamps/A8-s.jpg)
1973
Postage Due Stamps - Different Perforation
24. August 窗口管理器: 1 篩孔: 13½
![[Postage Due Stamps - Different Perforation, 類型 A9]](https://www.stampworld.com/media/catalogue/Singapore/Postage-due-stamps/A9-s.jpg)
