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Several threads have popped up recently in which erratic timekeeping of a number of Speedmasters have been discussed. I haven鈥檛 worn my Speedmaster for several months. So I decided I would dig it out and set it, and see how it performs in comparison. It has the gold plated calibre 853 movement in it, and it is 34 years old. I serviced it myself about one year ago. Model 345.0808. I don鈥檛 obsess with timing machine results. I just put it on and wear it. It is usually within about 30 seconds a week.