While I leafed thru this old copy of "The Gambler" I found this interesting item for sale:

Casino-weight small-key chips, available PLAIN or personalized, even including some with edge inserts.

This means Borland has access to unstamped small-key chips in a variety of colors. Hmmmmmmm.

(He also sold pre-stamped ONLY H&C, as a distributor for Paulson, but that's no different than gift shops and game stores.) The other molds listed are recognized as typically non-casino (Weave, Mr. Lucky, etc.) or are light-weight chips.)