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Hello dear watchmakers. Last week, I was lucky enough to get my self a beautiful vintage Seiko chronograph watch with 7015 movement. The overall condition looked great so I did not expect any problem with the watch. However, over the last few days, I noticed that this watch stops around 1~2am when the day disk moves to the next day. At first, I thought there was no residual power in the mainspring but the watch won't start after being shaken for some time. It runs well and keeps good timing after I move the day disk manually by adjusting hands by crown till the next night around 1 am. Could you please give me any ideas on this issue?? I really love this watch and want to make this watch perfectly functional. Thank you. I put some photo of the watch and what timegrapher tells