I would study the manner in which the cards were stamped - are they all stamped at the same angle with the same colored ink and stamper? This would lead you to believe he did this all in one sitting, and not as they trickled in, perhaps through purchases of cigarette packs. Do any of the card fronts display a slight reverse image of the stamp, similar to a wet sheet transfer? If so then he was probably stamping and stacking as he went along. Is the card wear similar throughout the collection? Just a few questions to kick around - it's an amazing endeavor, good luck with it!
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