The new logo was a script version of the word "Zippo" and was phased in about that time along with the year coding by the use of dots (.).
Over the years, the dating codes has been modified, several times over like for instance in 1966 till 1973 the code was denoted by a combination of vertical lines (|), 1974 until 1982 with forward slashes (/), and 1982 until the middle of 1986 with backslashes (\).
Dating a zippo
Around the late 70's the logo was redesigned again, but not implemented into the bottom stamp until 1980.
In July of 1986, lot codes were also being included on all Zippo lighters, showing the month and the year of production.
Inserts can also be dated by their material, number of holes in the chimney, flint wheel style, cam style and markings. Date codes appeared as early as 1955, and the dating system was fully in effect by 1959.
Very quickly, you can determine a broad age of a Zippo lighter based on the three major changes to the style of the word “Zippo” imprinted on the bottom of the lighter. Before 1959, dating Zippo lighters can be a bit tricky, as the exact placement of the words must be taken into consideration.
The Zippo Manufacturing Company started featuring at the bottom of the lighter case, on the left side of the logo, the month code in the center, and the year stamped in Roman numerals (XVI).
At the turn of the new century, Zippo Manufacturing Company introduced a new and easier way to recognize the date codes. Blaisdell, founder of the Zippo Manufacturing Company, the Zippo lighter carries a 100% lifetime guarantee on any problem that might arise with any Zippo lighter.
Blaisdell had date codes imprinted on the bottom of the lighter cases.
These codes provided him with the date of manufacture, should a defect be found, allowing him to maintain records of repairs.
At this time, the insert stamp was on the bottom section of the insert.