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The watch is gaining time – there’s a surprising reason!
As you may see, this movement is in pretty poor condition. It’s an old pocket watch movement, not regularly serviced, the plates are stained with corrosion and I suppose even when it did require repairs, the previous owner may not have invested much to have it done properly.
As you can observe, the watch was gaining at a rate of over 500 seconds per day, the amplitude was way down at around 150 degrees and the beat error was considerable at around 4.5 milliseconds.