I'm new here. I've just bought a very cheap Shenhua watch "Shenhua 9500". The attached manual claims an accuraracy of -5 to +20 seconds a day, but
the watch runs faster 5 minutes a day. I'm wondering whether is there some adjustment I can make. The watch is like the one shown on this video:
Skeleton automatic mechanical watch movement - Shenhua 2 Ebay - YouTube
Thank you very much for your help!