Introduced in 1953, the New York City subway token was simple solution to a problem engineers couldn’t solve—creating a turnstile that would accept two different coins for the fifteen-cent fare. (For 44 years, the subway cost a nickel, then for five years, a dime.) The iconic coin—most famously remembered with a large cut-out “Y” in the letters “NYC”—lasted for fifty years until they were finally discontinued in 2003 and replaced by the far more efficient (and lightweight) MetroCard. Today, the MTA’s Transit Museum Store still sells tokens—on cuff links, charm bracelets, and watches. And in a small way, perhaps wearing them lets you travel back in time.