Unless it is COSC certified +- 10 seconds is good (more)
A non-COSC certified mechanical watch would be doing good anywhere from +- 10 to 15 seconds a day. Initially, a new watch may not be as accurate, but usually stabilizes to a more acceptable rate over time. It's not unusual to get +- 5 seconds a day with a 2824-A2. Give it some break-in time.
Posted on Dec 9, 2001, 9:06 AM from IP address 18.104.22.168