Cartier / Jean Cartier HR

The Jean Cartier Artiste model that I have is hard rubber.
It has a broken tenon, so I won't be fixing it.

The key work is nice quality nickel silver.
Looks like it might be a Couesnon product. Compare with their Guy Renne.
Barrel: 62.95mm
Bore at top of left joint, 15.62mm. At bottom, 15.16. This is quite wide bore.