After 6 months since setting the time in March I need to adjust again for daylight savings. In that time I’ve taken regular data points and the watch has lost zero seconds. Over a period of 18 million seconds to lose zero is absolutely incredible. From my first 6 months of ownership I could see the watch was gaining about 1 second a month. Luckily the 9F62 calibre allowed calibration using a control dial when the watch case is opened. I used this to tweak the timing slightly and these results are following that.
The 9F62 movement is a masterpiece and I enjoy that it can be adjusted for decades to be as accurate as it is today.