Now showing: United States - Postage stamps (1990 - 1999) - 26 stamps.
22. January WM: None Perforation: 13
WM: None Perforation: 10 vertical
22. February WM: None Perforation: 11
1. March WM: None Perforation: 11
11. March WM: None Perforation: 11½ x 11
5. April WM: None Perforation: 11
30. April WM: None Perforation: 11
9. May WM: None Perforation: 12½ x 13 and 11
9. May WM: None Perforation: 12½ x 13 and 11
22. May WM: None Perforation: 11
30. May WM: None Perforation: 11
8. June WM: None Perforation: 11
2. July WM: None Perforation: 11
12. July WM: None Perforation: 11
8. August WM: None Perforation: 10 vertical
13. August WM: None Perforation: 11
28. August WM: None Perforation: 11
31. August WM: None Perforation: 11
7. September WM: None Perforation: 11
15. September WM: None Perforation: 11
17. October WM: None Perforation: 11
13. December WM: None Perforation: 10 vertical