I’ve just acquired a GMT with a crystal 3186 movement. In my reading I thought it to be a pretty good movement. In the first 24 hours wearing it I first noticed after about 6 hours it was slow by 2 hours. Reset it and it was fine the rest of the day. Took it off at night only to wake up and it had completely stopped about 3 am. Adjusted the time when I got up and will see how it goes today. Any suggestions on what I should do if this continues? Also, what ETA movement can I replace this with if that’s what I wanted to do and what might be involved in doing that? Thanks
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