Grandissime catch, my friend. Huge congrats, this one is a legend and a great piece of diving watch History. BUT it was not the first mechanical Depth gauge in a watch.
I stand corrected Nico :) This Nivada is just awesome ! I have never seen this before, it looks like you have found HYT's source code ;) ! Any more photo's ?
I will publish my article on significant diving watches, one day. An article I worked on for several years, and still in progress. Maybe for this year Xmas?
Hey, I only add this to my post for the newbies... here is a stunning cool watch... and yet... having bought so many of them... they are very different in reality... often they 'weigh' almost nothing... and unless in the most flattering light... reveal their age quite obviously... now... for the one collecting this watch knowing this... it only seals the deal! But I imagine the new guy looking at this stunning dial and I sometimes what to help that collector... old watches with stunning dials like this can--in real life--be a surprise... now with that said... I LOVE IT!!!