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Much research remains to be done and this page will be updated as this research continues.
All the information on this page has been obtained from a study of these dated lighters.
Note the difference in the colour cast between the two.
The width and placement of the word ZIPPO and the shape of the number 3 in the patent should also be noted My research so far has identified 9 changes in the stampings used.
This can (and has for me) make it a lot more difficult to date the insert than the actual cases, so all then information below is based on my own personal observations.
1 Horizontal teeth on flint wheel - Closed Chimney 2 Diagonal teeth on flint wheel - Closed Chimney 3 Diagonal teeth on flint wheel - Open Chimney Rounded Cam (Top) Square Cam (Bottom) Different pads From late 1951 until mid 1953 I have found no less than 6 different inserts in use. Rather than show the whole insert, I have decided to show just the stamping, as this will allow larger pictures for comparison purposes.