Collector technical vocabulary
Flint-wheel rivet
Glen documents hollow flint-wheel rivets through about 1963 and solid rivets appearing around 1961. The two types overlap from roughly 1961–1963, so rivet style is supporting evidence rather than a precise year code.
Source and interpretation
Sources: Glen's Zippo Page — Historical bottom-stamp, case/insert construction details, Canadian dating chronology, and transition research
This feature is supporting evidence alongside the case stamp, insert and other manufacturing clues. An individual component can be repaired or replaced.