There are two complete figures like this known to exist and two more that are missing heads.
Man....I’ve been collecting for 40 years and still learn stuff!
Check out the articles from the Star Wars Collectors Archive. More info can be found in the links below. Original Luke Skywalker Jedi Knight Action Figure DesignLuke in Robes Unpainted Hardcopy Torso and LegsQuoteThere are two complete figures like this known to exist and two more that are missing heads.