Excerts from 1866. Translation :
"In Monaco the administration has struck silver tokens which replace the piece of forty sous, and which circulate even as currency throughout the principality, On one side we read: CASINO DE MONACO, the other JETON DE DEUX FRANCS. "
My NOTE: Actually it says CERCLE DE MONACO not CASINO DE MONACO

“The jetons of nominal value of 2 francs and the intrinsic value of 1.75 francs were issued by the Director. These jetons, which have the double advantage of money and money, have rapidly acquired an active circulation, not only in the principality of Monaco but also in Menton, a French city, where this derisory sign from a gambling house is mixed pieces struck in your likeness. Thanks to this financial expedient, an ever increasing number of players are attracted around the green carpet, because people who came to change this resistant currency hardly to the temptation to deliver to the fortune of the gambling ( registration 1866)”
I have seen several sales of this jeton in the order of 200 euros.
Hope it helps.