Steve Goodrich's Montana Guide has the following info on the Montana casinos:
Flippers, 125 3rd St West, Missoula, MT, closed 1993, 25¢ (white) & $1 (red) chips listed both with a "c" value $5-9. Both diamond mold. No mention of a cancellation in the guide. What is the denomination on your chip. It may be one Steve can add to his next edition.

Panch Magoos, 1301 S Main St (Hwy 93), Kalispell, MT, closed 1992, 25¢ (purple, "c" value & $1 (white. 3 pur & blue), "d" value $10-14 chips listed. Your chip looks like another one that can be added to the next edition