I had the chip in 1999, and it had been in inventory at GGS for a couple of years. I doubt MM was Roman for year 2000.

Could have been made for Margarita Martinez' private games .

In the 90's, the Mexican peso was devalued by 1000. In the old currency, 100,000 pesos would have been about US$30, so not an unreasonable denomination for Mexico.