Just a thought for a possible source for this part.
Last night I stumbled across some pics from the Derwent engine catalogue when I was looking at a link between the notched ring on the trooper backpack and the notched ring that holds the Derwent intercoolers in place – they’re the bits used for the Obi ANH sabre emitter.
Anyway – I noticed that the Derwent engine has an oil filter with an element that looks a dead ringer for this one – even down to the way the ends of each outer roll are rounded over:
We know that the Derwent parts turned up all over the place, so I am reasonably confident that this might be the actual source.
Also, I recall a picture of Dengar’s back, with a very similar filter which was flattened out and in a frame held against the middle of his back. It was on Hyperspace, so won’t post it here, but some of you may recall it.
Anyway, just a thought, for what it’s worth.
Phil