Stamps of United States - Canal Zone, 3000 ndenom
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postage
1921, Nov 13 100th issue ovpted on stamp of Panama (no wmk info) (no perf info)
| - | 50c | on 50c (18) |
1925, Jun 27 1925 issue ovpted on stamp of United States flat plate print unwmk p. 11
| - | 50c | lil | ovpt, Arlington amphitheatre | — | — |
1928 1928 issue (no wmk info) (no perf info)
| X | 50c | lil | Blackburn |
1939, Aug 15 Panama Canal 25th issue
| - | 50c |
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