Posted By:
PaulI sure like the theory that the overprint stamp was BW's way of "cancelling" the cards upon redemption. But the fact that every single one of Scott's overprints is on a 150-series back really undermines this theory. Why would BW stamp only the 150-series backs?
I suppose it's possible that all of the blank backs (except Type IIs) came out after the end of the BW promotion that we are imagining occurred. Or maybe the blank backs were issued by another sponsor in a different part of the country, and for this reason were never turned back into BW to collect a prize. But that still leaves the "careful stamper" problem that Scott pointed out. Why would the guy with the purple redemption stamp so consistently stamp the cards in the same direction? I guess it's like asking how many licks till you get to the center of a Tootsie Pop - the world may never know.