Since I have quite a few in rotation, I'll wait until the 8-10 year mark. A few years ago when I bought a preowned Kermit (safe queen), part of the deal was to have it serviced for two reasons. 1) Even though it was very rarely worn, it was about 10 years old so I wanted a service and new gaskets. They do dry out and can let moisture in. 2) Being serviced at an RSC, the watch would then be in my name and I have the paperwork/documentation from RSC saying so. That's worth the money to me.
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