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These are likely unauthorized reproductions based on original, concept artwork of Robert McCall.

Rescuing astronauts from Skylab was possible in the most likely emergency circumstances. The crew could use the CSM to quickly return to Earth if the station suffered serious damage. If the CSM failed, the spacecraft and Saturn IB for the next Skylab mission would have been launched with two astronauts to retrieve the crew; given Skylab's ample supplies, its residents would have been able to wait up to several weeks for the rescue mission.

This is a replica patch produced by Randy Hunt.

Rescuing astronauts from Skylab was possible in the most likely emergency circumstances. The crew could use the CSM to quickly return to Earth if the station suffered serious damage. If the CSM failed, the spacecraft and Saturn IB for the next Skylab mission would have been launched with two astronauts to retrieve the crew; given Skylab's ample supplies, its residents would have been able to wait up to several weeks for the rescue mission.

This is a replica patch produced by Randy Hunt.

STS 51-B was the seventeenth flight of NASA's Space Shuttle program, and the seventh flight of Space Shuttle Challenger. The launch of Challenger on 29 April 1985 was delayed by 2 minutes and 18 seconds, due to a launch processing failure. Challenger was initially rolled out to the pad to launch on the STS-51-E mission. The shuttle was rolled back when a timing issue emerged with the TDRS-B satellite. When STS-51-E was canceled, Challenger was remanifested with the STS-51-B payloads. The shuttle landed successfully on 6 May 1985, after a week-long mission.

This patch is virtually identical to the A-B Emblem version, so it could possibly be a modern version from them using newer embroidery style.

STS 51-B was the seventeenth flight of NASA's Space Shuttle program, and the seventh flight of Space Shuttle Challenger. The launch of Challenger on 29 April 1985 was delayed by 2 minutes and 18 seconds, due to a launch processing failure. Challenger was initially rolled out to the pad to launch on the STS-51-E mission. The shuttle was rolled back when a timing issue emerged with the TDRS-B satellite. When STS-51-E was canceled, Challenger was remanifested with the STS-51-B payloads. The shuttle landed successfully on 6 May 1985, after a week-long mission.

This version of the patch has squared-off corners on the tab, single piece construction and modern embroidery. It also lacks a yellow border on the outer edge.

STS 51-B was the seventeenth flight of NASA's Space Shuttle program, and the seventh flight of Space Shuttle Challenger. The launch of Challenger on 29 April 1985 was delayed by 2 minutes and 18 seconds, due to a launch processing failure. Challenger was initially rolled out to the pad to launch on the STS-51-E mission. The shuttle was rolled back when a timing issue emerged with the TDRS-B satellite. When STS-51-E was canceled, Challenger was remanifested with the STS-51-B payloads. The shuttle landed successfully on 6 May 1985, after a week-long mission.

The Swissartex version of this patch has a radial border area stitching and  is a single piece construction.

There are two versions of this STS-51B patch manufactured by Swissartex Emblem Inc. One with a waxy matt plastic coated backing, & the other with a shiny vacuum sealed backing.

STS 51-B was the seventeenth flight of NASA's Space Shuttle program, and the seventh flight of Space Shuttle Challenger. The launch of Challenger on 29 April 1985 was delayed by 2 minutes and 18 seconds, due to a launch processing failure. Challenger was initially rolled out to the pad to launch on the STS-51-E mission. The shuttle was rolled back when a timing issue emerged with the TDRS-B satellite. When STS-51-E was canceled, Challenger was remanifested with the STS-51-B payloads. The shuttle landed successfully on 6 May 1985, after a week-long mission.