So, I picked up a 10 denominated Societé des Bains de Mer- Casino de Monte Carlo jeton that also has a reverse with a number 25. When I looked to see if the jeton was already included in ChipGuide, I found the same 10 issue, but with a 5 on the reverse and another one with 17. Then, looking further, there were several examples of 5 denominated jetons with different reverse numbers and one example of a 20 denominated jeton with a reverse number of 12.

Here is my example:

My question is, why the second number?

Thanks for looking!

Jim