Zippo, Zippo date codes and Zippo anatomy. - Zippo markings on the bottom
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To identify a potential pattern in any run of lighters returned for repair, the bottom of every Zippo lighter was encoded with a series of markings. Since the s. No, the "hash marks" on the bottom of a Zippo Lighter indicate the year it was produced. This is from the Zippo website. As you can see, from.