I would say rarest of the known colors. Even though it is a USPC chip, there are no records.

I wouldn’t be surprised if there aren’t 6 - 8 colors (green comes to mind)

I’ve had at least 2 reds, maybe 3. Surprised the auction went so high. (Although one had a “4” on the back)

Final bid, including fee and shipping was about $600 for the 2 red DENNIS chips