US - 1¢ Z Grill, 85A, 1867 ( the america's rarest stamp )
GRILL: Rows of pyramid-shaped embossing, impressed into the back of certain stamps. Grills broke stamp fibers, letting cancellation ink sink in, making re-use impossible
Only two One-Cent Z Grill stamps are known to exist
Currently valued at $2.5 million, make it the most expensive stamp in USA.
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