Georgian Pinchbeck Seal with Black Glass Base with Intaglio of Key
An unusual An early 18th century alloy of copper and zinc (9 parts zinc and 48 parts copper) invented by Christopher Pinchbeck. Another formula consisted of 83 parts copper and 17 parts zinc. It looks like gold, wears well and maintains its colour. A stone or metal plaque carved with an image (an intaglio) but with design reversed so that it is readable when impressed in wax.
made circa 1800-1820 set with a black glass on the base that has an An engraved stone, the opposite of a cameo, with a recessed design cut below the surface of the stone. Intaglio designs are common for signet rings and fob seals. of a key with the words around it “Turn it not against me”.
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