This can't be the only one. Each T206 card has a unique appearance that acts like a sort of fingerprint.
We should put together some kind of distributed research project where a high resolution scan of a signed T206 card appears side-by-side with all of the scans of known auction records. If the card isn't a match, you hit "next" over and over until all are viewed. Multiple people can go through 100,000+ cards fairly quickly.
|