PAT.2517191
PAT.2517191
Base Stamps 1966 to 1973
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1966 | llll llll PAT.2517191 |
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1967 Early | llll lll PAT.2517191 |
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1967 Late | llll lll | The patent expired on August 1st 1967, so the patent number was removed |
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1968 | lll lll | |
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1969 | lll ll | |
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1969 | lll ll | In 1969 the "Z" of Zippo acquired a 'tail' The ® was moved slightly and 'BRADFORD' was moved to the right See detail |
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1970 | ll ll | |
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1971 | ll l | |
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1972 | l l | |
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1973 | l | |
Inserts 1966-1973
Two different inserts were used in this era, the first being a continuation of the 1959 insert. After August 1967 Zippo removed the Pat 2517191 and the insert should be single sided as per the photograph below. There are however a number of minor differences that may be found. (Detail Differences)
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| This insert is the 1959 style, but with the solid flint wheel rivet introduced in 1961. This insert was in use until late 1967 | 1967 insert. Used until 1975 |
Some lighters made between 1968 and 1972 have a "Solid Fuel Cell" rather than the usual cotton wool packing. This cell is made from pressed rayon and was possibly trialled to speed up the process of inserting the packing. The problem is that the wick cannot penetrate the cell and has to be 'bunched' up at the top of the insert. This reduces the amount of contact area with the wick and therefore the amount of fuel that the wick can absorb. I have heard a number of reports of these cells disintegrating when a collector has tried to remove them, so are best left undisturbed.
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| Bunched Wick from Rayon "Solid Fuel Cell" | Rayon Solid Fuel Cell |
Some lighters made in the early 1960's have the felt pad made from red felt
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Various shades of Red Felt have been documented, but it may have been that the fuel discoloured the felt over time. |
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Around 1970 the cam spring was changed from the narrow style to the widespread style. Narrow cam springs have been found in 1971 lighters
