Thank you @imagwai for the URL!!
I've had emailcontact with a maintenance specialist here in the Netherlands for Tag Heuer watches and he told me that Quartz and mechanical watches from Tag Heuer need maintenance every 5-6 years and that the costs (here in the Netherlands) would be around 660 dollars for mechanical and half of that for Quartz. He also told me that the cal. 16 is a very reliable mechanism.
Furthermore, after a few nights of sleep, I think that maybe 60 years is a long time for one watch and I owe myself a new (extra) watch when we are married for twelve and a half years!
To be continued
Im not sure if the quartz chrono is different, but my quartz watch needed a battery after 6 (i think) years, which was about 120euro, and now keeps perfect time. No service required and its had a lot of knocks over the years.
My first TH Quartz from 1994 works perfectly; just battery replacements over the years.
Here's one for sale:
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