Stamp Finder ↺ Scott or Y & T ? Airmail 1929-1930 Airmail Stamps dates of issue – 25c: May 5, 1930; 50c deep violet: November 4, 1929; 50c pale violet: March 3, 1931; 75c: March 3, 1930; 1g: November 30, 1929 (source: Michel catalog) Sc C1 ('30) / YT PA1 Sc C2 / YT PA2 Sc C3 ('30) / YT PA3 Sc C4 / YT PA4