Putting the high quality items up would have been a bit too unfair.I used their base images as they were both clear and concise.Slim lighters were first introduced in 1956, with a flat bottom and no date code.
There are a few quick ways to tell a Zippo's true age. And '50-present have 5-barrel internal hinges, except for some special editions I have seen with 4-barrels, but are newer replicas with the appropriate date codes on the bottom. '86-2000 used month letters (A thru L) and year Roman Numerals: II = '86 and XVI = 2000.
3/4 configuration with a centralised patent for the 1959 Zippo.
The individual images for each base were lifted from Max Cadys site to create the wallcharts (the hyperlink to the MC site is on the Links page), As a result of that I have only put the lower resolution charts up here.
From 1957-1965 the code configuration on the slim lighters differed from the regular lighters (See Date Code Chart below). 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.