It's a very, very nice watch!
My friend's one has a problem with the crown - it doesn't start the chronograph. I had to open the back case and push the lever directly. And it worked! And I mean that watch doesn't eveN know what an overhaul is!
Beautiful movement. It was the first time I was so close to a chronograph movement, imagine the emotional impact. Hopefully I will get to be confident enough to open, clean, oil and put back together one of those! It's an Everest on my list!
I am a little envious ( :) ) of you to have received such a beautiful and rare piece of history! He must be a very close friend of yours, your older friend.
Enjoy it!
p.s.
And tell your friend that if he has other similar beautiful watches to be taken care of, we are here to help!