Le Maison de Cartier is both and excels at both.
That really is a stunning looking Cartier Tortue and is both horology and jewellery for a man. Wear and enjoy it in good health. Marc
I don't have one yet...
...but the Pasha GMT is singing an undeniable siren song. It seems like only a matter of time... I'm in the "both" camp. pic from 1st dibs ...