Adam, I welcome you, but I'm going to make a digger out of you.
If you're a collector, you might find digging, as the FUN part of the hobby.
If you're a flipper ... you'll find it boring.
This forum has an excellent search engine.
Go to it, and write in __ Dr Koos __ in the Posts options, and then do the Threads option. ... If you want to learn about a subject, you would have to read all you can about the subject.
At the 1990 Texas National, many of the dealers were alerted.
They listened, but they didn't stand together.
Because of that ... here are a few of the later results .....
http://www.net54baseball.com/showthr...highlight=Koos