The Death Star Droid is up for review this week. First released in 1979 on a 20 back card the Death Star Droid was available until the end of the line in 1985. As far as major variation go, there are no known ones. The Death Star Droid can be found on all major types of card back 20 and higher, but wasn't sold on a POTF card.
Again, I really don't have much to say about this figure. The body is the same as C-3PO, expect for the color. The head is the only real difference. But I think Kenner did a knock out job with it. It looks very good in my eyes.
And again it's one I didn't have as a kid, but picked mine up in the fall of '99 off eBay. The black paint is still there, but the limbs are all super loose and the body looks beat up. Oh well, I could always by another one.