Since the chip has SQINCIR mold and those were produced by Portland Card Co. in Oregon, give some thought to Oregon Caves National Monument. Located in SW Oregon near northern California, I haven't visited in about 25 years when I retired to Oregon but have some good memories of the place. Lots of marble in the caves and many mites and tites formed from the dripping water. It's conceivable the chips were made for a club or private operation in the same general area. The caves are celebrating their Centennial this year so they have been known long enough for chips like this to have been designed with the images you see and to have been influenced by the geology of the caves.