Base Stamps 1986 to 2000
In 1986 Zippo adopted a system of Roman numerals to identify the year of manufacture. As there was no no requirement to use both sides a letter was added to denote the month of manufacture. A=January, B=February up to L=December
|1986||II||Only G to L (July to December are known to exist) (See Note)|
|1990||VI||From October 1990 the words MADE IN U.S.A were added|
|1991||VII||Some lighters are know to exist from 1991 with the 'Made In USA' missing. The base stamp is the same as that used in early 1990|
|1991||VII||On later lighters the bottom line was "Stretched" (note the position of the ® relative to the bottom line) The earliest I have seen this is April, but I have seen later lighters with the short bottom line. It can only be assumed that both stamps were being used throughout the year|
|1996||XII||A minor alteration was made to the hinge in April, from this date the lower part of the hinge is bevelled (See detail)|
|1998||XIV||1998 saw the first use of the "crossed I" (where the letter I in "Made In U.S.A." has the line to the top and bottom. I have found this on lighters from May, June July & August of this year, but further research is necessary.|
|2000||XVI||Lighters made in January & February only have XVl on the base. The I on the bottom line has regained its cross lines|
|Lighters made from March onwards have both 2000 & XVl on the base. The "I" on the bottom line has also lost the cross lines|
1986 to 2000 Inserts
Around 1988/89 a minor alteration was made to the cam spring. The end nearest the flint wheel gained became tapered
In 1992, the design of the felt altered. Previous felt had a small hole (Possibly designed for storing a spare flint) this was removed and the felt was printed with "LIFT TO FILL" This is printed on both sides of the felt.
Towards the end of 1995 / early 1996, the typeface used on the stamping altered. The wording remained the same but the font size was increased.
1982 to 1986
2000 to 2006