Have a look for something with a Valjoux 7730/7733, same chrono configuration and very serviceable. I picked this Ollech and Wajs (35mm ish) up for £125, although it’s off for a service next month and that’s gonna bite.
Also just found the original eBay pics, I did take a bit of a punt.
yeah, it looks cheap. Internetz says that they weren't designed to be serviced but instead replaced