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The missing stamp on the surface was bothering me, I knew the buyer nor the seller would scratch it up and remove the stamp. So I figured I'd do some searching and found the previous auction:

NOS...

There was a thread about this Escher or a similar one at B&B (offline atm). Sic.transit rings a bell for me so I think it's the same guy. The labels are not copies of each other, I assume both were...