That is a Hermle 340.020 movement. Nobody I know of bothers to fix those. Check out the price of a replacement movement from Butterworth Clock Industries in Iowa. You could likely replace the movement for about what it would cost to repair and service what you have. Newer models of this movement have been improved with bronze bushings at points of greatest wear. Yours is old enough that it is not one of the improved ones. The movement in yours was made circa 2015. So 8 years old. Not worth fixing, as I see it. Oh, by the way, it is next to impossible to overwind a clock. Did a mainspring actually break?
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