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Some important points to note are the shape of the "3" within this patent number, some lighters have a round top 3 whilst other have a flat top.
Also look carefully at the placement of the word "ZIPPO".
is an Andean plant which originated in the area surrounding Lake Titicaca in Peru and Bolivia.
When trying to date these earlier lighters it is important that close attention is paid to the exact layout of all three lines.Earlier lighters are much more difficult to date accurately.I am going to start with the last undated lighter as this is the easiest to date.For this reason this page should be considered as a guideline only.Lighters made before 1953 had the earlier 2032695 patent number and it is the placement of this number, along with the placement of the word "ZIPPO" that can help identify the date.
This lighter was made between 19 and is identifiable by what is known as the "Full Stamp".