Cool Dating Zippo Lighter Inserts 2023. This code has had many iterations over the years. The earliest lighters has 16 holes in the chimney, but this was reduced to 14 around 1936/1937

As with most collectibles, the date of manufacture of a zippo lighter often affects its value. Simply swap it with the standard windproof insert in any classic. Starting in 1958 zippo used date codes (there were prior date codes, but no one seems clear on exactly what they were).

