Zippo Crown Stamp Zippo Classic Windproof LighterFor decades, the Zippo bottom stamp has marked the authenticity of every genuine Zippo lighter. The simple system of dots and slashes, initiated to aid identification of lighters coming back to Zippo for repair, was later replaced by letters and Roman numerals, and still later by letters and digits signifying the month and year of manufacture. This lighter collection tells the story of our stamping process and in three unique ways. Add a piece of