All the battleship sheets and contemporaneous postage stamps were printed by the Federal Government's Bureau of Engraving and Printing. In the early years of the BEP's work as the sole printer of US stamps it adopted the practice of the private bank note companies of placing a branding imprint in the margins of the plates and sheets. The top image above is of a 2 cent documentary with a short margin and a partial branding imprint. The bottom image is comes from a plate block of the 2 cent proprietary, but clearly shows the imprint.
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