I have a Cartier Roadster that has been serviced by Cartier every 3-4 years. My 1999 second edition Monaco from Tag Heuer has only been serviced once by Tag when I also had to replace the acrylic crystal that had a deep scratch in it that couldn't be buffed and polished out. Otherwise it has never had an issue.
I sold my Cartier Santos 100 after owning it for over 10 years and never had to service it as it kept perfect time.
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