re: Watch Service - How Often and Where?

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I'm very fortunate to have recently received a Seamaster from late 90's early 2000's. It has been sitting in a drawer for over a decade. After the first week, it's running around +4 spd.

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If it's running only +4 seconds per day, it's still within COSC specs. It may be a good idea to send it in because it's been sitting for so long, but I wouldn't send it in unless it starts running slower than that.

I don't know anyone who suggests servicing every year. Service intervals for most luxury watches are ~10 years.