Here is another out of my collection.. This was my grandfather's Zippo from the 1950-1954 era. Pat Pending 2517191 with original ZIPPO font. He worked at GE General Electric his entire life,
Value of VENETIAN Laser Engraved All Sides Sterling Silver Lighter with Zippo Pat 2517191 Insert | iGuide.net
Vintage 1950s Zippo Lighter With Box Pat 2517191
Just rescued this 50's zippo Pat. 2517191 : r/Zippo
VINTAGE 1958 PAT. #2517191 ZIPPO CIGARETTE LIGHTER - DOBSON CORP. PEST CONTROL | eBay
ZIPPO LIGHTER VTG 1950 PAT 2517191 PAT.PEND. MASONIC LOGO EMBLEM COMPASS SQUARE | eBay