Zippo started coding their lighters since 1955 with dots. The code was denoted with vertical lines from1966-1973. It was coded with forward slash and backslash. From 1986, Zippo started coding all lighters with month and year of manufacturing. It was said that Zippo Lighters were made by prisoners along with the numbers identified the prisoners' crime and year of punishment. In 2007, Zippo launched something new named Zippo blue weight loss plans features much like the original Zippo. ...