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Opened July 1999, zOwie is the Internet's first and longest running discussion forum dedicated to Omega brand watches.

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Re: How do you really check watch accuracy?
In Response To: How do you really check watch accuracy? *LINK* ()

: My first question when you say your watch gains
: 2.5 seconds per 30 days is, how do you know
: that?

: I've been tracking my 2254.50 (same movement as
: yours) for almost two months now, checking
: it against the USNO atomic clock at 3
: specific points in the day.

I check it against the USNO once a week or so, and use the total number of seconds gained or lost x 86,400 (the number of seconds in a day) / total number of seconds in the sampling period.

This is just a spreadsheet formula I use on my log to keep track, both of the running weekly average and the average over the period between resets. My SMP is gaining about 2.5 seconds a day, so once a month I reset it 30 seconds slow, and by the end of the month, it's about 45 seconds fast. Then, just pull the crown and let it run for 75 seconds for the next month.

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