pontil mark

A 'pontil mark' is a telltale sign of traditional glassblowing techniques, indicating where the glass was separated from the pontil rod.

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Definition

(technical)A scar or rough spot left on a glass object where it was attached to the pontil rod during the manufacturing process.

The antique bottle had a visible pontil mark on its base, a sign of its handcrafted origin.
Collectors often look for the pontil mark to verify the authenticity of old glassware.

Terms that have similar or relatively close meanings to "pontil mark":