Well, that didn't take long. Just a week after posting five cards from the 2022 Panini National Treasures Collegiate collection, I was able to buy a One of One Black Printing plate of Herschel Walker, from that very set.
I didn't have to pay a whole heck of a lot for it and the fact that I was able to fill in another 1 of 1 space in Walker's TCDB page, pleases me no end.
For those who may not know, there are four printing plate colors used in the manufacture of most trading cards. Black, Yellow, Magenta and Cyan.