I just can't rob their story, so here's the link to their story.
I did want to mention, however, that this is one of the many bits of hobby knowledge that you should really have if you are going to be taking part in the vintage baseball card hobby.
Some unscrupulous sellers might try to pass of the several other Doyle cards that say Nat'l on them as the very and coveted error version. Below is a little visual for you.
Notice that all three of these Doyle cards have the same caption at the bottom: DOYLE, N.Y. NAT'L.
Some beginning collectors may have heard of the super rare Doyle error that says Nat'l on it and be fooled by one of these cards. Now look at the more common version of the Doyle that has an error.
Notice that this version does not have the NAT'L after the N.Y.
This is the common version. Feel free to try to find the error out there in the hobby somewhere. Really. I mean it. Good luck. Let me know if you ever find it. Ever.
The late great Larry Fritsch, one of the great hobby veterans, the first full time mail order dealer spent years looking at hundreds, if not thousands, of Doyle's in search of one before he found a single example. And that was before the rest of the hobby was privy to the fact that it was an error. In other words, nobody else was seeking it or keeping it from him because they thought the one they had was rare. It just doesn't show up anywhere.
I'm very excited to see this one is going to be auctioned off in an upcoming REA auction. I can't wait to see what it brings when the hammer drops.
Enjoy the hobby all, it's a great one...