Bob, Your chip was a generic chip available out of chip catalogs. They are quite common (25¢ to 50¢, at most).

The C&S below was a custom chip, in all probability made for a club ("The Sportsman"?). There is the possibility that it was made for some rich person for his private game but that is not likely. I don't know of more than 5 or 6 of these chips in all colors combined.

I don't have a trader. However, if I did, it would be expensive. C&S (especially the rare pieces) have become extremely expensive since the entry into this field of collecting of several people with deep pockets