Several threads have popped up recently in which erratic timekeeping of a number of Speedmasters have been discussed. I haven’t 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’t obsess with timing machine results. I just put it on and wear it. It is usually within about 30 seconds a week.