1925 (August 14), Cristobal to San José, Costa Rica, SCADTA pioneer flight cover, on Panama Canal "Official Business" stationery, franked
1925 (August 14), Cristobal to San José, Costa Rica, SCADTA pioneer flight cover, on Panama Canal "Official Business" stationery, franked with 1c, 2c, and 3c Canal Zone overprinted Washington-Franklin definitives, tied by purple circular COLOMBIA-CENTRAL AMERICA AIR MAIL / PIONEER TRIP cachet, reverse with Limon / Costa Rica (14 Aug) transit and San Jose / Costa Rica (15 Aug) arrival c.d.s., very fine and scarce, with only 25 covers carried. (Mueller #5).
