During the 1950's and 60's Peru produced ornately hand-engraved Sterling silver lighter cases designed for the Zippo insert. While the ones shown below were not produced by Zippo, they are beautiful to behold and intended for Zippo inserts. These are usually marked "Peru" and "925" on the bottoms, meaning the silver is 92.5% pure. The gold is usually 14 or 18 karat. Popular engravings are images of llamas, and pre-Inca and Inca mythological gods and characters