Stamp Finder ↺ Scott or Y & T ? International Geophysical Year 1958 Regular and Airmail Stamps (October 8, 1958) Sc 424 / YT 384 Sc 425 / YT 385 Sc 426 / YT 386 Sc 427 / YT 387 Sc C119 / YT PA129 Sc C120 / YT PA130 Sc C121 / YT PA131 Souvenir Sheet (October 8, 1958) Sc C121a / YT BF8