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Fredrik · 27 July 2020, 04:45 PM

I do not know exactly what the differences are between the the older and newer, faster, 1500-series movements are.

Could it be a 1570-based movement with a 1560 balance? That would give you those symptoms.

27 July 2020, 04:45 PM	#6
Fredrik 2024 Pledge Member Join Date: Oct 2011 Location: Sweden Watch: 1680 Posts: 1,825	I do not know exactly what the differences are between the the older and newer, faster, 1500-series movements are. Could it be a 1570-based movement with a 1560 balance? That would give you those symptoms.