Stamps of Panama, 20th of any month of any year
51 to 88 of 88
airmail
1948, Feb 20 Revolutionary Junta of 1903 issue unwmk (no perf info)
| - | 50c | dkgray & blk | Carlos Constantino Arosemena | |||
| - | 1b | grn & blk | Nicanor de Obarrio | |||
| - | 2b | yel & blk | Tomas Arias |
1952, Feb 20 1952 air surcharges a issue ovpted (5 stamps)
| - | 0.02b | on 10c (72) | ||||
| - | 0.05b | on 10c (72) | ||||
| - | 5c | on 2c (71) | ||||
| - | 25c | on 10c (72) | ||||
| - | 1b on 5b | Lefevre, w. unwmk, p. 12 |
1952, Oct 20 Queen Isabella 500th issue (no perf info) (6 stamps)
| - | 4c | org & blk | ||||
| - | 5c | ol & blk | ||||
| - | 10c | |||||
| - | 25c | slbl & blk | ||||
| - | 50c | |||||
| - | 1b | blk |
1963, Aug 20 Freedom of the Press issue (no wmk info)
| - | 5c | org & red |
1963, Dec 20 Winter Olympics 1964 issue unwmk
| - | 0.05b | multi | Slalom | |||
| - | 0.21b | dkgrn & red | Slalom |
1964, Feb 20 (no wmk info)
| - | 1b | multi |
1968, Jan 20 Visit of the President of Mexico issue unwmk
| - | 50c | multi | Girls from Panama & Mexico in traditional costumes | |||
| - | 1b | multi | Presidents Gustavo Diaz Ordaz & Marco A Robles |
1971, Aug 20 Apollo 11 issue (no wmk info)
| - | 13c | multi |
1971, Dec 20 150th Anniversary of Central American States' Independence from Spain issue
| - | 13c | multi |
1973, Jun 20 Famous Panamanians (11 stamps)
2003, May 20 Nata 480th issue
| - | 1b | multi | — | — |
airmail semipostal
1961, Dec 20 Malaria Eradication issue wmk. star & RP multiple
| - | 5+5c | red | ||||
| - | 10+10c | ultra | ||||
| - | 15+15c | grn |
postal tax
1960, Jul 20 wmk. rectangles
| - | 1c | car & gray | — | — |
51 to 88 of 88