STS-35 - 4" - A-B Emblem

STS-35 was the tenth flight of Space Shuttle Columbia, the 38th shuttle flight, and a mission devoted to astronomical observations with ASTRO-1, a Spacelab observatory consisting of four telescopes. The mission launched from Kennedy Space Center in Florida on 2 December 1990.

An in-depth write up about the A-B Emblem version of the STS-35 patch and variations can be found here.