The STS-51A crew wore the standard AB Emblem embroidered mission emblems on their flight suits and on their in-flight clothing, thus there is no rare 'crew patch' for this mission.
The AB Emblem patch was the version used by the crew.
The Lion Brothers STS-51A mission patch only exists with a vacuum-sealed plastic backing. The design uses a distinctive orange thread for the eagle's beak and wing edge.
The vintage version of the Swissartex STS-51A mission patch exists both with a waxy plastic backing and with a vacuum sealed
clear plastic coating on the reverse. The fronts of the two versions are virtually identical.
The patch has uses distinctive radial pattern in the fill thread of the border area.
The Cape Kennedy Medals patch has very crudely stitched artwork. The tail on the reverse is held in place with a small strip of tape, as is the case with several of their other patches.