After putting WatchTracker on my phone, I started tracking the accuracy of some old manually wound watches. Two were quite consistent from day to day, with one gaining about 26 seconds/day, and the other gaining about 70 seconds/day. A third is much less consistent, starting out gaining about 60 seconds/day and then more recently beginning to lose time. Assuming the watches are wound once/day, is this normal or is it an indication that something in the inconsistent watch is not working as it should?
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