Here's an interesting set on Ebay. Scan is not good. But here is what Dan says about them. If I didn't already have a number of neat sets I'd be after these.
I don't know of any "Grand Royal" casino other than the Mole Lake, Wisc. Indian casino.

Travis:

The chips are designed with five stars going around both sides of them and
the center of the chip says the denomination and has the casino name of
grand royal. printing is gold and black. hope this helps you .
remail if you have other questions. White chips are $1.00 Red are $5.00
and Green is $25.00
dan