If you take a look at the ‘comments’ on the Movement Table page, you’ll see a story from Brian, who bought a watch for his mother in 1972. The watch was used on a daily basis up to a couple of years ago. Brian has measured the watch against his atomic clock over the last few days and found it to be within a couple of seconds per day! Impressive or what? And….the watch has never been serviced!! Pretty remarkable and an impressive tale of reliability and accuracy.
The watch is a Cosmostar V2, a fine little high beat movement running at 28,800 beats per hour. Here’s my example: