Explorateur de timbres ↺ Scott or Y & T ? New York’s World Fair 1964 Regular and Airmail Stamps (March 22, 1965) Sc 521 / YT 526 Sc 522 / YT 527 Sc 523 / YT 528 Sc C233 / YT PA298 Sc C234 / YT PA299 Sc C235 / YT PA300