These are great chips with an ever-developing history. The chips you have were indeed used as promotional chips for dinners...and a lot of the more colorful ones found I BELIVE were made in the 80's by George Davies at T.R.King as salesman samples. The more extravagant the color and edge spots, the higher the price it seems in the collector market. They are very special to the TRK fans out there.

Good Luck with your find!

E