A set of various armor castings from Richard Marquands 1983 sci-fi classic, Star Wars - Ep VI - Return of the Jedi. Made for the production of the film, the set consists of six pieces of various sizes made of vacuform plastic. The crescent-shaped pieces were crafted as rebel biker helmet bills...
I don't think that these visors were ever used in the final Rebel Endor Trooper helmets, as the other auction shows the visor as molded integrally to the armor ring, and these visors don't have the right shape to my eye.
A production-made Endor rebel trooper helmet from Richard Marquand's Star Wars: Return of the Jedi.
The screen-used visors are shaped more like a formal military dress cap visor, which has a shallower crescent shape, whereas these separate visor castings are shaped more like a squared baseball cap duckbill.
Endor Rebel Trooper backup helmet bucks from the production of Richard Marquand's Star Wars: Return of the Jedi. Rebel Troopers wore their modified camouflage costume as they travelled to the forest moon of Endor.
It's split right down the center "between the eyes" like the screen used pieces and has some excess along the seams, so it appears to be somewhat of a quick-and-dirty backup. Of note is that the visor as NOT a part of this backup buck. I still however think that the screen used helmets had visors that were part of the helmet armor mold because the fully-completed unused auction listing has a seam down the center of the visor. If the visor was cast as one piece as in the "various castings set" then that seam would not be there.