Kind of large for a $50 chip; just under 2-inches (1-15/16).

I know there's one floating around on the NY-Canadian border, but I've not been able to snag it yet... but it is there for sure. It was also spotted in a display case in Boston, a few years ago.

These two examples came from New York State as well... Must have been a really nice set, I bet.

Anyway, if you happen to see it around, I'll be more than happy to pay a $500 reward (+ the price of the chip).