What is this thimble worth?

A long while back on eBay I purchased a metal or silver thimble (I collect) with "Drink coca-cola" printed on red enamel around the bottom. The auction claimed it was from the sometime in the 1920s and somewhat rare. It has a couple of nicks on the enamel but is in suprisingly good condition. It set me back 22 dollars. Does anyone know how much it's worth, if anything?