Here’s a link to one of the back scarcity articles.
https://www.psacard.com/articles/art...ifferent-backs
In terms of pricing, I know that P42 has not held up to the 8X that I originally assigned. It’s more like 4X now. I’m sure some other multipliers have changed for better or worse.
Also, the back multiplier for HOFers is (and always has been) less than advertised—typically about half. So for example if a Ganzel CB sells for 25X a Jimmy Collins CB might sell for 12.5X.