Explorateur de timbres ↺ Scott or Y & T ? 16th Congress of the UPU 1970 Regular and Airmail Stamps (June 23, 1970) Sc 634 / YT 668 Sc 635 / YT 669 Sc 636 / YT 670 Sc C357 / YT PA447 Sc C358 / YT PA448 Sc C359 / YT PA449 Souvenir Sheet (June 23, 1970) Sc C359a / YT BF32 25th Anniversary of the United Nations 1970 (December 14, 1970) Sc 640 / YT 673 Sc C360 / YT PA450 Sc C361 / YT PA451 Sc C362 / YT PA452 Sc C362a / YT BF33