After a very long search I finally found the elusive ref 6782 ! I have been looking around for a long time indeed but never saw one up for sale. That was untill recently, when I got a tip from a friend (thanks Philipp !). Although it is not fully orginal (crown) and the case is not mint, I did not hesitate at all to buy it, especially at the bargain price (realy !!) I could buy it. Inside this rolex turn-o-grah like VC is the cal 1072/1 with roller bearing (4 rubies) rotor and giromax balance. I am very happy indeed !
Now I only need to find that original crown (not even sure the crown on it is a VC one) but I am afraid finding one is as hard as finding a buckle these vintage pieces came with. Any info is much appreciated though. Movement wise I would like to get it serviced. Is it best to send it to VC ?