The appearance of the word "Zippo" in the bottom stamp provides another clue to dating.
There have been three major changes, as show in inset.
The world-famous guarantee that It works or we fix it free™ still covers every Zippo windproof pocket lighter today.
If your Zippo lighter needs repair, send via a trackable method to Zippo Repair Clinic, 1932 Zippo Drive, Bradford, PA 16701.
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.
As with most collectibles, the date of manufacture of a Zippo lighter often affects its value.
Valuable information on the bottom of every Zippo windproof lighter can help you determine its date of manufacture.
Starting in the mid 50’s, date codes were stamped on the bottom. The date codes have since become an invaluable tool for Zippo collectors.
Most lighters fabricated between 19 can be identified by style and model and the patent or patent-pending marks.
Slim lighters were first introduced in 1956, with a flat bottom and no date code.