made specially for the Big Three who used it in their Genta designed models: AP Royal Oak, Patek Nautilus and VC 222 (launched in the late 70s). The case is monocoque steel and the movement is placed into the case from the top side and the bezzel is screwed on, this results in a rather slim watch with a 120m water resistancy.
The 222 existed mostly in yellow gold and yellos gold and steel, more rarely in steel.
I wouldn't mind seeing VC come out with a modern reinterpretation of the 222.
For more info use the search function and if you check the Press Corner there is an excellet article in Revolution called A Decade of Evolutionary Brilliance : the Evolution of the Overseas and you will find some background on the history of the 222 whic directly inspired the Overseas models launched in 1996.
As for the number of pieces produced, VC does not disclose them bt considering that in the 70s VC probably didn't make more than 3500 watches you can guess that production was rather low.
As you see in the doc the seller gave you the watch came with a money clip in the same form as the bezzel!!
Would love to see more scans and congrats on a beautiful watch