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Do you know what Seiko movement you think it is? Like I said, it’s a 28800 beat rate movement so it can’t be the Seiko NH45A. Was there another Seiko movement being used in the ZF RM?
To be honest im not quite sure. However, I do know the problem you mention is super common to all the seiko powered RM 35. Its a natural quirk at this point lol. If it is really bad my susgestion would be to have a look for someone that can service the watch and try the hack thats avaiable on the forums. Hope this helps.