Explorateur de timbres ↺ Scott or Y & T ? Definitives 1924-1945 Recess printed by the American Bank Note Company, New York. Line perf. 12. Regular Stamps (September 3, 1924) Sc 315 / YT 253 Sc 316 / YT 254 Sc 317 / YT 255 Sc 318 / YT 256 Sc 319 / YT 257 Surcharged for Airmail (July 6, 1933) Sc C4A / YT PA4A Surcharge (1944–1945) Sc 359 / YT 299 Sc 359a / YT 299