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The appearance of the word Zippo in the bottom stamp provides another clue to dating.
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From 1963 to 1967 the imprint on the insert was changed changed from the horizontal (upright) to the vertical The flint wheel rivet can also be used to help date the lighter.
The solid rivet first appeared in 1961 replacing the hollow rivets used up to that time however the hollow rivet continued to be used up until 1963.
From 1933 to the mid 50s the word Zippo was stamped in block letters. Zippo records indicate an overlap of bottom stamp configurations from 1949-1957.
The Zippo script logo was developed in the late 40s and was phased-in on the lighter bottom stamp around 1955. Also, some lighters produced between 1955-57 were date coded, however, specifics remain unclear.