I don't think this watch will have a screw down crown. When you have the crown set in the winding position, so pushed in towards the case and when you turn it is winds the watch, does the crown sit right next to the case, or a few mm away? If it's right next to the case, it does not screw down. If it sits a few mm's away, and you can compress a spring inside the crown to make it go closer to the case, then it is a screw down crown, and the threads of the crown, case tube, or both are stripped.
Cheers, Al
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