I saw Roger Smith give a talk in London on Friday night, and someone asked how often his watches need a service... he said... I don't know.
He gave an example of a watch sold 10 years ago - the customer has ordered, and was collecting a second watch, so Roger gave his first watch a look over. Still running to the 3+ seconds a day it was at when it left the workshop 10 years ago, still lubricants where they need to be, and the watch is worn heavily.
I guess it really does depend.
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