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Pontil Marks

December 22nd, 2015 by Piper Smith

Most bottles made before 1858 have an indentation on the bottom, known as a “pontil mark” where the pontil rod– used to hold the bottle while it was being formed– was snapped off. Pontil rods were often made of iron, so the marks may contain rust-colored residue stuck in or around the hole. Bottle collectors and archaeologists use the pontil marks as a dating tool.