My 3 6 9 12 is less than 100 nummers closed to yours. I sent my 2 vintage Fifty Fathoms to Blancpain for the vintage service. Now I have to wait about 6 month to get informations about the works which to have to be done. Then it will take another 6 to 8 m...
I’m neither a diver nor expert on BP, but that looks like a design that is serious about diving, though not at the expense of aesthetics or refinement.