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airmail
1949, Dec 7 100th Anniversary of the Montevideo University issue wmk. REPUBLICA O. DEL URUGUAY (no perf info)
| X | 31c | ultra |
1952, Jan 16 1952 air issue
| X | 31c | brn | Four-motored plane |
1956, Jan 19 First National Product Exposition issue
| - | 31c | airplane & emblem |
1956, Dec 15 Uruguay stamp 100th issue wmk. RA in sun
| - | 31c | stamp of 1856 & stagecoach |
1956, Dec 15 Jose Batlle y Ordonez 100th issue
| - | 31c | Jose Batlle y Ordonez | — | — | ||
| X | 31c | brn |
1959, Feb 13 Santos Dumont issue wmk. REPUBLICA O. DEL URUGUAY
| - | 31c | multi | Santos Dumont |
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