Old bucherer but not much info

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I inherited this Bucherer 17 Jewels from my grandfather. I sent pictures to bucherer and they told me they didn't have info on pieces from before the new group took over. It runs ok but when I brought it to my watch guy for a service, after a few weeks he told.me he couldn't get the crown retention screw out without damaging it.

I've not found too many like it, any way to find more info?
 
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Thanks for the heads up! I posted over there and will scroll the thread later.