I'm sure Miles is right. The thin wire wrapped around the glass helix is a flash trigger electrode. The photo brings back old memories. I used to play around with these devices as a teenager back in the sixties.
Thanks for the replies. I guess all it's about good for is an ornament. Cheers, Dex
Put it up on eBay as untested. Some go bad with age. Could be worth a few hundred or at least a fiver.
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