Illustrated historical reference · Case & bottom stamp
1938–41 — Case & bottom stamp reference (1938–1941)
Early stamp ranges are approximate; use overall stamp style, patent markings and insert details together.
- Known period
- 1938–1941
Reference images
Evidence, source and dating limits
Sources: In Quiet Detail — Primary photographic and collector reference archive; Moonlight Zippo — Historical bottom-stamp variants, Slim dating chronology, and Canadian bottom/insert period references
Dating caution. This is a documented period reference, not proof of a precise manufacturing year. Case and insert can have different manufacture dates; inserts may have been replaced. A single feature does not establish authenticity.