If I was lucky enough to find one like this, I wouldn't touch a thing. But I'd probably take it out and look at it nightly. There are very few like this left out there and clearly it's sealed perfectly...this is a museum piece.
Amazing, you are one lucky man and being in the right place at the right time with the necessary $'s.
Total envy, drool, on my knees facing Switzerland !
Clean and lubricate, the horological Gods are with you.
from my point of view : the watch is so damn good it deserves a shower and some love. i would clean it from the wrist cheese and polish the crystal, nothing else.
I would service the movement. I can see a hair or something on it. And for a movement that has never had the screws turned, they sure made a mess of the case back trying to get it off in the past!!