I did some research on the chips in my role as a California ChipGuide Admin, and found that they were used at a place in Tacoma, Washington.

Advertisement from 1/12/1970 (The News Tribune).

ChipGuide link here; http://cgcm.themogh.org/cg_chip2.php?id=WATASG&sort=type

Sorry, but I don't know anything about their value.