Maybe the only one, or one of a very, very few. It's made out of some sort of Hard Like Plastic? You can tell it's old and original when holding it and looking at it. It's not a new piece.
The item "VERY RARE Original 1960's Mountain Dew Bottle Cap Store Soda Sign COLA COKE" is in sale since Wednesday, May 1, 2019. This item is in the category "Collectibles\Advertising\Soda\Mountain Dew". The seller is "asseenonpawnstars" and is located in Brodhead, Kentucky.This item can be shipped worldwide.