Zippos had a flat bottom until 1946 when the bottoms were indented.
There have been three major changes, as shown in inset.From 1933 to the mid 50s the word Zippo was stamped in block letters. From August, 1949 through July, 2002 Zippos were also produced in Niagara Falls, Canada - the only place other than Bradford, PA where they were ever produced.The Zippo script logo was developed in the late 40s and was phased-in on the lighter bottom stamp around 1955. About 13.5 million lighters were produced by Zippo Canada.The bottom stamp differs by having Niagara Falls, Ontario rather than Bradford, PA on it.ASR, Colibri, Dunhill, Dupont, Evans, Negbaur, MTC, Rolstar, Ronson, Rowenta, Zippo and many others... You will also find books, catalogs, patents and magazine advertisements on lighters! The descriptions, images and content above are copyright, all rights reserved, The Antique Lighter Shop, 19th March 2010, who will instigate legal proceeding against the publishers or designers of any publication or web site containing text (including meta tags) photographic images, or graphics originating from this source without prior written permission.
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While the information for dating a Zippo is widely available, it isn't that handy to find it all in a single location.
This should provide the information to fix a relatively precise date for any Zippo lighter.
Slim lighters were first introduced in 1956, with a flat bottom and no date code.
The first markings were added in 1957 and overlapped into 1958.
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.