Though there are several of the 100F chips about, I have not seen any other denomination and the seller in Italy does not have any; other than this one 500 I bought from him.

I do not question the seller's attribution that the CM (alphabetical) monogram is from Monaco; I do not know.

Even though the monograms on both pieces appear to be the same; the engravings do jot appear to be the same -- as are not the serial numbering engravings...

A positive monogram match with anything else would be helpful.