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Is the pontil mark polished smooth and shiney, or satinated, or.... is it central, is it completely round... are there marver or mould marks around it....... you get the idea!
(A pontil is the iron rod the hot glass is held on to - it leaves a pontil mark when it is removed. Glass does not have a pontil - except when it's stuck on the iron, it just deosn't make any sense, Steve.

sorry - this is my own particular bugbear. :pb: )