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This version of the STS-3 souvenir patch, at first glance, looks like the Lion Brothers version, with the distinctive blue nose, but the details are much more crude and the embroidery style is more modern. 

Modern version of the A-B Emblem STS-3 patch. 

Modern reproduction with modern embroidery and nice detail. 

STS-51-F (also known as Spacelab 2) was the nineteenth flight of NASA's Space Shuttle program, and the eighth flight of Space Shuttle Challenger. It launched from Kennedy Space Center, Florida, on 29 July 1985, and landed just under eight days later on 6 August.
While STS-51-F's primary payload was the Spacelab 2 laboratory module, the payload which received the most publicity was the Carbonated Beverage Dispenser Evaluation, which was an experiment in which both Coca-Cola and Pepsi tried to make their carbonated drinks available to astronauts.

Modern embroidery, single piece body. The border is almost light blue. Bare back.

STS-51-F (also known as Spacelab 2) was the nineteenth flight of NASA's Space Shuttle program, and the eighth flight of Space Shuttle Challenger. It launched from Kennedy Space Center, Florida, on 29 July 1985, and landed just under eight days later on 6 August.
While STS-51-F's primary payload was the Spacelab 2 laboratory module, the payload which received the most publicity was the Carbonated Beverage Dispenser Evaluation, which was an experiment in which both Coca-Cola and Pepsi tried to make their carbonated drinks available to astronauts.

This patch uses modern embroidery and is a single piece. Curously, the shuttle's body is executed in blue thread.

STS-51-F (also known as Spacelab 2) was the nineteenth flight of NASA's Space Shuttle program, and the eighth flight of Space Shuttle Challenger. It launched from Kennedy Space Center, Florida, on 29 July 1985, and landed just under eight days later on 6 August.
While STS-51-F's primary payload was the Spacelab 2 laboratory module, the payload which received the most publicity was the Carbonated Beverage Dispenser Evaluation, which was an experiment in which both Coca-Cola and Pepsi tried to make their carbonated drinks available to astronauts.

This patch has modern embroidery and is a single piece. This particular example has a white border (instead of gray) and has a bare back.

STS-51-F (also known as Spacelab 2) was the nineteenth flight of NASA's Space Shuttle program, and the eighth flight of Space Shuttle Challenger. It launched from Kennedy Space Center, Florida, on 29 July 1985, and landed just under eight days later on 6 August.
While STS-51-F's primary payload was the Spacelab 2 laboratory module, the payload which received the most publicity was the Carbonated Beverage Dispenser Evaluation, which was an experiment in which both Coca-Cola and Pepsi tried to make their carbonated drinks available to astronauts

The Swissartex patch is a single piece design with lightly rounded corners on the tab.

This STS-51F is one of three different subtle design versions manufactured by Swissartex Emblem Inc. from 1985 to 1991 before they changed their name back to Eagle Crest Emblem Inc. & moved their opperations to Taiwan. All the differences are at the base of the patch were the names 'Acton & Bartoe' are. The one shown in the image above is the first version with a waxy matt plastic coated backing. The other two versions have the shiny vacuum sealed backings. The differences are in the angular & length / area of the extended 'tab' part of the patch. Also one version has a red or pink tint to the vacuum sealed backing.

STS-51-F (also known as Spacelab 2) was the nineteenth flight of NASA's Space Shuttle program, and the eighth flight of Space Shuttle Challenger. It launched from Kennedy Space Center, Florida, on 29 July 1985, and landed just under eight days later on 6 August.
While STS-51-F's primary payload was the Spacelab 2 laboratory module, the payload which received the most publicity was the Carbonated Beverage Dispenser Evaluation, which was an experiment in which both Coca-Cola and Pepsi tried to make their carbonated drinks available to astronauts.

The A-B Emblem version has a sew-on tab.

STS-3 was NASA's third Space Shuttle mission, and was the third mission for the Space Shuttle Columbia. It launched on 22 March 1982, and landed eight days later on 30 March. STS-3 was the first shuttle launch with an unpainted external tank, and the only mission to land at the White Sands Space Harbor near Las Cruces, New Mexico.

The nine-month-long ALT program was conducted from February through November 1977 at the Dryden Flight Research Facility and demonstrated that the orbiter could fly in the atmosphere and land like an airplane, except without power-gliding flight. Two NASA astronaut crews-Fred Haise and Gordon Fullerton and Joe Engle and Dick Truly-took turns flying the 150,000-pound spacecraft to free-flight landings.