Illustrated historical reference · Case & bottom stamp
1951–54 · Canada · Patented 1950 variant A — Case & bottom stamp reference (1951–1954)
Glen distinguishes this early Patented 1950 Canadian base stamp by the shape of the 9 and the position of the final 0 relative to ONTARIO. It is associated with early nickel-silver inserts and is documented through at least 1954; Glen explicitly notes that research on the exact changeover remains ongoing.
- Known period
- 1951–1954
- Plant
- Niagara Falls / Canada
- Evidence / certainty
- reported
Reference images
Evidence, source and dating limits
Sources: Glen's Zippo Page — Historical bottom-stamp, case/insert construction details, Canadian dating chronology, and transition research
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.