While digging the foundation of a house addition, I found several old coke bottles and. i thought i only needed one example and i could trade the rest but as I was cleaning them I realized the obvious, there was at least six different types of Coke bottles, all from Roanoke. If I were to study them more, I might find other differences. I think this would be one reason there can never be a complete guide to all the bottles ever made as even a few years can produce several different varrities from the same bottler. The only bottle that this is not true might be ketchup bottles, they all look alike to me.