#date-codes

0 articles · 2 raw sources · 1 inventory

Inventory

Does the H&H 3-lb Crystalvac jar really carry a 1932 Owens-Illinois date code? 2026-07-26

One Hoffmann-Hayman three-pound Crystalvac jar bears the Owens-Illinois 'Diamond-Oval-I' mark read as plant 7 (Alton, IL) / year code '2' = 1932. A base photograph of the jar now C…

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Next: Corroborated by the base photo (plant 7, undotted date code 2 = 1932). Optional: confirm across more examples / an expert bench read before closing.

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Raw sources

Photograph: base of the H&H 3-lb Crystalvac jar showing the Owens-Illinois mark · 2026-07-26
Owens-Illinois: Texas presence, plant codes, and Diamond-O-I dating (Lockhart / SHA Bottle Research Group) · 2026-07-26