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If that's the case, do I have an Escher for you! It's also in far better condition than this one. You can also have it in either 2.5"x6" or 2.5"x(5"+1")... Until you make the choice you can only...

Could be, there's no label on the stone, and no guarantee it belongs to the leftover of the Escher box, but it's likely.
Certainly cannot be honestly labeled as 'Escher' anymore, but if you mostly...