Do the hash marks on the bottom of a Zippo lighter show different quality the more hash marks there are? - Quora
Zippo - Date Codes | Zippo USA
Kerosene lighter zippo genuine collector-grade limited edition pure copper thickened armor double-sided five generations bottom logo
ZIPPO LIGHTER NEW BLUE or RED DRAGON HIGH POLISH GOLD CUSTOM MADE IN USA | eBay
Zippo on Twitter: "In 2001 we launched a Zippo lighter made of Grade One commercially pure titanium. Should we re-release it? http://t.co/7tdnHblfv0" / Twitter