Explorateur de timbres ↺ Scott or Y & T ? 50th Anniversary of the ILO 1969 Regular and Airmail Stamps (September 22, 1969) Sc 621 / YT 648 Sc 622 / YT 649 Sc 623 / YT 650 Sc C345 / YT PA427 Sc C346 / YT PA428 Sc C347 / YT PA429