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It's a date stamp. You can determine when your Zippo Lighter was manufactured by the hash marks or other symbols stamped on the bottom of your lighter. This helps Zippo owners in determining the value of their collectibles. You can find the chart for the Date Stamps here:

http://www.zippoclick.com/collecting/dateCodes.aspx

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13y ago
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14y ago

it is a date code for the factory to tell when the lighter was made when it comes back for repairs. Zippo started using 4 dots on each side of Zippo on lighter bottom in 1958-removing 1 dot from right-then left the next yr. until none. In 1966, same deal with vertical hash marks-1974, started slanted hash marks. 1986,letters and Roman numerals. This is so yr. of make can be easily determined.

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Q: What are the marks on the bottom of zippo lighters?
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