There are 14 colors of chips blank on both sides that have SQINCR molds and 18 chips with no mold and blank on both sides. I can send you all these for $65 delivered in USA.

Here is a 1948 flyer from a local distributor (Robin Specialties) that sold PCC chips:

I'll include either a copy of the scan of the flyer, or of the flyer and business card themselves (if I can find them).

The final group of PCC samples will be of different color chips with SQINCR molds various numbers of edge spots (from 2 to 4). Will take me a few more days to post these final 90 or so samples.