Stamps of United States - Canal Zone, 30c denom
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postage
1924, Jul 1 1924 issue ovpted on stamp of United States flat plate print unwmk p. 11
| - | 30c | olbrn | ovpt, buffalo | — | — |
1925, Jun 27 1925 issue ovpted on stamp of United States flat plate print
| - | 30c | olbrn | ovpt, buffalo | — | — |
1928 1928 issue (no wmk info) (no perf info)
| X | 30c | Williamson |
airmail
1931, Nov 18 1931 airmail issue
| X | 30c | roselake | plane over Gaillard Cut |
1939, Jul 15 zone airmail 10th issue - planes over landscapes (1939) unwmk p. 11
| - | 30c | rosecar |
1964, Aug 15 Panama Canal 50th issue (no wmk info) (no perf info)
| - | 30c | brn & blk | jet over Miraflores Locks |
1965, Jul 15 1965 airmail issue unwmk p. 11
| - | 30c | redbrn & blk | zone seal & jet plane |
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