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A faint, blue, circular seal is visible in the lower-left portion of the page. It features a hexagram (a six-pointed star, often called the Seal of Solomon) with a central design and surrounding text within the circular border. The seal appears to be a mirrored impression or show-through from the opposite side of the leaf.
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Signature B: This letter was a printer's mark used to help bookbinders assemble the printed sheets in the correct order.