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.
Bore at top of left joint, 15.62mm. At bottom, 15.16. This is quite wide bore.