This is the LIN-V8K droid in 1/12th scale, aka the mining droid, from the Sandcrawler scene in Star Wars. Thanks to an old 1970s electronics magazine article about the robotics in Star Wars, I was able to see what was happening under the tinted dome. This is 1/12th scale, so it would have been challenging to make those four mirrored disks spin which they did in the film – there are four lamps shining light on each disc, so there’s a bit of interesting light reflection behind the tinted dome (which you can see in the film).
