Probably before the ''Must line''. Cartier NY ? There are no silver marks on the case,'' Must '' models where either plaque on 925 silver or the where made of 750 gold. A few where only silver without plaque. Love the black dial. Kind regards, Ronald
remind me a bit of the Tank Arrondie. I do believe that this NY version is equiped with the same movement eta 2512 as the the swiss Must tanks en LC of that time. Always to repair by a skilled watchmaker I think. best luck. regards, Ronald