Zippo - We've heard some wild rumors about the meaning of the bottom stamps on Zippo lighters. Some say it's the quality rating of the lighter, others say it's the inmate number
Zippo MARLBORO lighter ANTIQUE SILVER PLATE VERY RARE | eBay
Value of ZIPPO SILVER PLATE Lighter with Etched Corners Front & Back (Zippo, 1994) | iGuide.net
Silver Plated - in need of wisdom! Seems unfired -which suggests it's unused- yet it's blackening out, is that like silver-patina or is the plating wearing off? : r/Zippo