This three cents George Washington postage stamp was issued by America in 1868 (= Scott Catalogue # 94). It is part of a set of definitives issued in the 1860s and denominated 1 to 90 cents. The set replaced previous postage stamps that were declared invalid for postage at the onset of the American Civil War in the 1860s. This was done to prevent southern states from making money by selling older stamps.
The earliest varieties had no grills, but in later years, the stamps were issued with grills of various sizes. A "grill" is a grid of tiny punctures in the paper. Grills were intended to prevent washing and reuse, because cancellation ink would soak into the broken paper at the grill points. Seven grill types are recognized, based on size and geometry of the grill points, and are designated "A" to "F", plus "Z". This stamp has an "F grill".
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