The scan of 6 chips you are show in your post include 5 USPC chips and 1 Burt chip.

The pink chip you show is a Burt chip

Carefully inspect the 8 chips on my site:

http://www.oldpokerchips.com/NonNevada/Wallace.htm

The first two chips are Burt the other 6 are USPC. Note that the Burt inlays are slightly smaller than the USPC inlays. Als, the fonts are different. Note the letter "N". The USPC "N" is narrower than the "N" on the Burt chips.

I've also noticed that the celluloid used on the USPC chips yellow over time. Burt chips don't d not use celluloid. Note that the Burt chip inlays remain white

Bottom line, to my knowledge there are 6 colors of USPC chips and 2 colors of Burt chips