Something I can add about my experience. (Problem appeared after a year, now returned from RSC). I always thought, even from new, my SD43 felt a bit “gritty” and rough when manually winding. It was noticeably noisier than my 116600 (something I’ve read numerous times from others too.) Since it’s return from RSC the winding is buttery smooth and the watch is silent. Significant? Who knows?
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