I think the Plank and Wagner numbers are closer than you think. Remember, when a Wagner lands into an advanced collection, it stays usually. The Planks are traded more often due to value. I figure Wagner 60 - 70 examples and Plank 80 - 90 examples. You can't really judge by how many have come to market. Several Wagners were acquired years ago in the 1970s by advanced collectors and are still in those collections.
How can O'Hara and Demmit be tougher than the Magie error as the list shows??
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