I just got back on the RPF and saw this thread. Wish I had seen it sooner. I have some info here for you, hope it helps.
This is from an Ebay auction for the original ANH chest box.
Here is the text
138. Darth Vader chest appliance from Star Wars. (TCF, 1977) As established in the first film, this chest control panel monitors Darth Vader's cyborg implants, which keep him alive in a controlled environment within his sealed mask and body armor. This prop, constructed for the first film and appearing only in the first film, consists of a fiberglass backing plate painted black, with four resin mounting points on the back for attachment to the Vader costume. The front has red and green resin buttons on the right side, and three silver slots on the left side, which are actually coin-slots from a British vending machine. The static rocker switches just beneath are constructed of gray-painted wood, with one switch on the extreme left side painted white. Bracketing the buttons and switches are two black rods painted silver (which are said to have been conscripted from the tips of the X-Wing Figher miniatures). This piece was worn by David Prowse in costume as Darth Vader in the first
Star Wars film; the higher budget of the second film,
Star Wars: The Empire Strikes Back (TCF, 1980), allowed this portion of the Vader costume to be completely re-designed and improved. A fantastic relic from the original film, and from perhaps the greatest cinematic villain of the last 25 years! Measures 6 1/2 in. x 6 3/4 in.
And here is the pic..
thomas
