To expound a little on the "Non-Coca Cola" - "Franchise Flavors" ...
The Coca Cola Company never had it's own (patented) line of fruit flavors until it introduced "Fanta" in the United States in 1960. Which was first introduced in Germany around 1940. Prior to this, the individual bottlers were responsible for producing their own flavors. However, since they were under contract by Coca Cola, the parent company required their name be on all of the bottles. Thus the "Coca Cola Bottler" designation that is so often seen. One of the more popular brands during the 1950s was "Big Chief. " It came in numerous flavors like strawberry - grape - orange - lemon, etc. I have about twenty Big Chief bottles in my collection, and I believe everyone of them is marked "Coca Cola Bottling" in one manner or another.
So that's why we see so many straight-sided bottles from the 1920s and 30s that have "Coca Cola" on them. Which was only allowed in "block" letters. The Coca Cola "script/signature" was exclusive to true Coca Cola only.
Not everybody liked Coca Cola, especially kids, and every bottler needed to have an assortment of fruit flavors to compete with the likes of "Orange Crush" - "Nehi" and various other brands that were on the market at the time.
SBB