greggs

STS-51-D was the sixteenth flight of NASA's Space Shuttle program, and the fourth flight of Space Shuttle Discovery.[1] The launch of STS-51-D from Kennedy Space Center (KSC), Florida, on 12 April 1985 was delayed by 55 minutes, after a boat strayed into the restricted Solid Rocket Booster (SRB) recovery zone. STS-51-D was the third shuttle mission to be extended.

This is an apparent modern reproduction, single piece patch, fully merrowed edge.

This STS-51D patch could be manufactured by Eagle Crest Emblem Inc. (formaly Swissartex Emblem Inc.). Swissartex manufactured a one piece vacuum sealed backed version nearly identical to the image above. The one shown above has a shiny plastic coated backing to it which fits in with Eagle Crest Emblem Inc. patches.

STS-51-D was the sixteenth flight of NASA's Space Shuttle program, and the fourth flight of Space Shuttle Discovery.[1] The launch of STS-51-D from Kennedy Space Center (KSC), Florida, on 12 April 1985 was delayed by 55 minutes, after a boat strayed into the restricted Solid Rocket Booster (SRB) recovery zone. STS-51-D was the third shuttle mission to be extended.

Below are two versions of the A-B Emblem STS-51D patch. The mid-blue and light blue versions. The mid-blue is more difficult to find.  There is also an AB Emblem example were the main body of the patch is an original STS-41F patch, but with a mid blue 'tab' sewn onto the bottom to make the whole patch a STS-51D. 

This patch was for the original STS-41F mission (reflown STS-51D)