Check out this page from Coca-Cola about collecting bottles!
I probably receive more questions about bottles than any other single item, simply because they are what most people find. Often someone will dig up a contour or "hobble skirt" bottle from the 1920s and immediately assume they've struck gold.
They're often disappointed to learn that even the earliest of the contour bottles are not terribly valuable because the bottles were produced in the millions. The standardized contour bottle was patented in late 1915 and became more prevalent as bottlers phased out the straight-sided bottles that preceded the famous design. Petretti's Coca-Cola Collectibles Price Guide (11th Edition) lists a 1916 embossed contour bottle that sells for just $6 to $15. To a novice collector, it's almost a case of reverse sticker shock. It's a classic case of supply and demand. Because the embossed contour bottles were mass produced, exceptionally durable and available for more than 40 years, they generally have modest values as collectibles. To the naked eye, these bottles will look pretty much the same. The only differences from 1915 to present day for embossed bottles are changes in the trademark registration notice and patent notice on the bottles.
Here is another great resource for ANTIQUE Cola bottles from Collectors Weekly
... the first man to bottle Coca-Cola did so without the permission of the company—in 1894, Joseph Biedenharn began to bottle Coke so customers could take the carbonated drink to picnics and other spots outside of the soda fountain. His idea spread, and by the beginning of the 20th century, two lawyers named Benjamin Thomas and Joseph Whitehead had obtained exclusive bottling rights from Candler.