Zippo date codes.
Date codes were originally put on the bottom of Zippo lighters to track the types of repairs that were being performed and I doubt that anybody at the time would have realised how that move would make these lighters so collectable.
Slim lighters were first introduced in 1956 with no markings, the markings were introduced in 1957 and overlapped into 1958. From 1966 the date codes for slim lighters has been the same as the regular size lighters. The codes below will help you to date your Zippo but other factors need to be taken into account. For example, the earlier inserts also have different markings for certain years and it can be quite hard at times to accurately date your lighter.
Date codes for slim line Zippo lighters.
1957 .... .... 1958 .... .... and .... ... 1959 ... ... 1960 ... .. 1961 .. .. 1962 .. . 1963 . . 1964 . One dot left side. 1965 no markings.
The chart below will help you to date your regular size Zippo lighters.
Anatomy of the Zippo lighter.