This vintage metal bicycle clip depicts Saint Christopher, the patron saint of travelers and transportation related occupations (for everyone, not just Catholics). It attaches to the bike's handlebars or support tubes, but I've seen a few of these adapted for use in automobiles and motorcycles. About 2-1/4" diameter, it's made of nickel silver (an alloy of copper, nickel and zinc with no actual silver content). In very good, clean condition with just a little age darkening on the back.