Confirmation On A 1700's Jeton? Several Questions

It is a Nuremberg jeton, or "rechenpfennig".

Nuremberg was the centre of token-making in Europe, with various rival families making and selling tokens, for whatever purpose the token buyer wished to use them for. What they were most likely to be used for, depending on when they were made. Jetons were initially made for use on a "counting-board", an abacus-like device which was used to aid in currency conversion back when currency was predecimal and maths had to be done using Roman numerals. But in later centuries, they found use as card game counters.

Your "MCI" is probably supposed to be "HCL" - Hans Christian Lauer, being the last and perhaps greatest of the Nuremberg dynastic token issuers; he mechanized and industrialized the process - though as you can see with this piece, quality control was sometimes lax.

Though your jeton depicts the French king, it likely was not used in France; jeton-making was a royal monopoly in France there were strict controls against importing Nuremberg jetons into France.

Yeah, thanks to both of you, I thought the obverse was a Latin motto, and I thought one of the earlier searches (this was a few years ago) of mine brought up a Nuremberg link.