For mechanical watch Service Intervals, what do you follow?

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Depends on the watch too. If it starts acting up, keeping poor time take it in.

I have a $60 Merkur which isn't economical to service too. Will likely replace it and put the fallen soldier in a display /shadow box or something.

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Watch service is 5 years for water resistance and probably 10 years otherwise with the modern oils they use. Any watch under 400 bucks replace the movement instead of service and under 200 bucks just replace the watch. Quartz movements are very cheap while Japanese movements are usually under 100 bucks. Swiss movements start at 200 bucks so you have to determine the saw off points from there with up 100 bucks to change it out.

For anything modern 10 years feels like a good rule of thumb. I also record my watches' performance on a timegrapher once a year, especially amplitude which can be helpful in identifying deterioration.

Anything vintage gets a service immediately after purchase as any parts needed are getting scarcer and scarcer.

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OldSnafu

Watch service is 5 years for water resistance and probably 10 years otherwise with the modern oils they use. Any watch under 400 bucks replace the movement instead of service and under 200 bucks just replace the watch. Quartz movements are very cheap while Japanese movements are usually under 100 bucks. Swiss movements start at 200 bucks so you have to determine the saw off points from there with up 100 bucks to change it out.

Right, many people ignore WR. I would otherwise service if the watch if it starts to be outside of the manufacturer's specs from an accuracy perspective. (It would take a really expensive watch for me to follow the manufacturer's service interval.)

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I’ve always heard 3-5 years from the manufacturer, 10 years on the long end if you wear daily… I typically split the difference at around 7 years