Read the stamp

Mason jar identification

MASON describes a jar closure tradition; BALL, KERR and ATLAS name different jar brands or manufacturers.

Brand, patent and mould numbers

Read the embossed brand and secondary wording before the small base numbers. MASON’S PATENT NOV 30TH 1858 refers to a closure patent and appears on jars made later. A base mould number usually tracks manufacture rather than stating a year.

What to check next

Compare the logo lettering, shoulder wording, closure and base together. A metal lid can be replaced, so its brand or date need not match the glass jar. Use the appropriate maker’s logo series to narrow the jar period.

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