Interesting mold selections. Yes, some seldom seen ones.
The 4th chip shown (pink) is made by CARO & FILS, from France.
The "C" in the mold stands for CARO...plus the repetition of 4 suits.

Here's a similar one, but the 4 "C's" are replaced by C+A+R+O in between the 4 repetitions of suits. (A little hard to read, because of the notches.) I have one without notches, but can't seem to find it.) Note that the order of the suits is reversed from the pink chip you show.

Pic from MOGH/ChipGuide (Caro & Fils listing from the Manufacturer section)