Since this one was just overhauled. I wanted to check when the date change over actually tripped. Here are the results within spec I sat in front of the watch with cell phone in hand and waited for the date to trip. These are some of the dumb things I can do wasting time. Interesting to view at least now I know when the date change takes place. My wife walked in the room asked what I was doing. I told her she just shook her head.
Were you expecting it to change at precisely 12:00? You may find the calendar changes at different times, throughout the month. Perhaps only by a few seconds on any given day. It is a mechanical watch, after all!
No I just happened to be sitting at the pc I looked at the time and noticed the date change started to take place around 11:45 so I figured what the heck cell phone near by so you see the results. I do have a couple watches that the date change takes place a few seconds after midnight