Hello, I am thinking about having my Heuer Autavia wrist wach (1969) fully serviced at an authorised TagHeuer dealer. The watch seems to have not been serviced yet, at least I cannot see any opening marks on the back. I assume that the movement needs to be cleaned, the case reworked, maybe the dial changed, all functions are OK. Has anyone and idea about the costs? Any recommendations where I should have it done in Germany?