KJL RARE COLLECTIBLE medallion charm pendant 21 goldtone Kenneth Jay Lane

A vintage medallion or charm by Kenneth Jay Lane from 60s-70s that says simply "21". Goldtone, 7/8 in. diameter. No chain. Rumored on the internet to be a souvenir of the famous "21" Club of New York City, but I can't verify. Cool story, if so! Either way, it's a Kenneth Jay Lane collector's piece. Signed "K.J.L."