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The Zippo script logo was developed in the late 40s and was phased-in on the lighter bottom stamp around 1955. Since the 1950s, those markings provide a way to accurately date most Zippo lighters.
Starting in the mid 50s, date codes were stamped on the bottom. The date codes have since become an invaluable tool for Zippo collectors.
The appearance of the word Zippo in the bottom stamp provides another clue to dating.
There have been three major changes, as shown in inset.
This stamp was used until 1967 and a lighter with this stamp could have been made anywhere between those dates.
The insert can be used to narrow down the dates a little.