Crown & stem recently came right out on my 1680 ..
Took it to an AD who popped it back in again in 5 minutes. There's a retaining screw of some sort (can't remember the proper name) that holds in the stem. Quite common to come loose as it only takes half a turn.
Your watch may not actually need a service. If it's within 15 secs/day, for a vintage I wouldn't bother for now. imo
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insta : NigelUK
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