Quote:
Originally Posted by phillip ridley
Good question but a very hard one to answer! I wouldn't say there is a "for sure way to know" other than knowing it's maintenance records.
Some signs to at least keep an eye on:
1. If you manually wind your watch and feel hesitation of grittiness.
2. Power reserve is under 24 hours.
3. Accuracy is not what it was or within specs.
4. Moisture under crystal. As simple as that may sound, I see this a lot! Keep in mind these gaskets do have a life span before they harden up.
5. Keep an eye on the external parts; if you see corrosion on the case tube or if your crown doesn't have a full rotation or more, know those parts are wearing out.
6. Again, maintenance records!!!
Rolex movements are some of the best built durable mechanical pieces in the world!! Even if they are running in an atmosphere they were not designed to, they can keep good accuracy! At least for a while.
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Great context and tips, thank you!