. (sorry, posted in wrong thread)
Years ago, I was doing a front/back census on the W502 set and it's amazing how many intricacies there are to it. The "Three Bagger" and "Home Run" backs are deceptively rare. Over the course of a few years I polled Net54 and watched auctions and eBay to try and catalog all the different combinations there were, just to get a feel for relative scarcity.
Ultimately, I think Arthur has a good point about those two backs. We can talk about things like 1921 Herpolsheimer and other E121-related backs, the toughest T206 backs or 19th Century type cards, but when it came to those three bagger and home run backs, there were literally only a handful of examples with either back, after years of watching. About 50% of the W502s out there have blank backs, and a substantial number of the rest were single and double backs, printed with different orientations and messages. But there were only a handful of cards with the triple and home run backs. I'm not talking about a handful of cards with that possible front/back combination, I'm talking about a handful of CARDS, in the entire universe of cards I swept up in my census.
Sadly the whole census got wiped in a hard drive crash, but if I recall, there were single digits of cards with either back. That's pretty tough, relatively speaking.
-Al
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