Served by a watchmaker. (Cleaning, timing, lubrication.)
It happens that they do not start immediately after winding the mechanism. In this case, you need to shake the clock and it goes. The watch has been lying around for a while and when wound with the crown, it doesn't start. After manually swinging the pendulum, the watch starts, but it may stop.
This nuance is included in the price.
After my test i find that
Running time without winding up to 2 days (about 44 hours)
Please read all photos and