Identification guide

Kerr Self Sealing Mason jar dating

With Kerr Self Sealing Mason jar dating, the glass jar and a removable lid can come from different production dates.

Embossing and base numbers

Record KERR, SELF SEALING and MASON exactly as arranged. Small base numbers can identify moulds. The glass jar and a removable lid can come from different production dates, so keep their marks separate.

What to check next

Compare the complete side embossing and base with the jar form and closure. A patent reference supplies a design-history clue. Use a documented Kerr logo variant rather than converting a single base digit directly into a year.

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