I have another open face model one that dropped its roller jewel. Not usually a problem, unless the man who is servicing it looses your case! It’s in a nice hunter case now, so I’ve experienced the versatility of owning a key wind movement the hard way!
In defence of the watchmaker... he retired soon after as Alzheimer’s took a more solid grip and the reason for the lost case became clear. A sad way to end a career.
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