My thanks to all who responded. In addition, I received an email from Bud Meyer who wrote the following:

"Your hc chip was madeby portland card co. 8-7-53 for Happy canyon Roundup. Gillenders & Burroughs Pendeleton Oregon.
1953 -5000 chips
1957 -5000
1959 -5000
1960 -2000 red
1963 -3500

All chip are green except the 1960 order. PLEASE POST THE I D."