| YEAR | BOTTOM | TOPICS |
|---|---|---|
| 1955 |
|
Late in 1955, a new italic Zippo logo was adopted. And to indicate the year of manufacture, "Yearly Identification Codes", which were various combinations of dots, were developed and stamped on the bottom. |
| 1956 |  |
Slim Zippo lighters were introduced in 1956 and put on the market for women. |
| 1957 |  |
The inscription of "PAT. PEND." was eliminated from the bottom. |
1958 |
 |
The inscription of "PAT.2517191" was moved to beneath the Zippo logo. |
1959 |
 |
Late 1959, engravings on the insert were placed vertically. |
| 1960 |  |
|
1961 |
 |
In 1961, the hollow brass flint rivet was replaced with the solid rivet. But the hollow revets were used until early 1963. |
| 1962 |  |
|
| 1963 |  |
|
| 1964 |  |
|
| 1965 |  |
