Since I began this project, hippos have begun finding me in the strangest places. I ran across these at World Market today and, of course, had to buy one. Funny thing is, I don't even drink soda.
When I got home, I dug around online a bit to find out more about the company. I found that there was an old company that used to sell this brand of soda, and I found some photos of the old bottles, which actually had hippos molded in the glass itself.
I searched a bit further and found an old sign advertising the drink. Turns out that old sign is for sale! I called the antique shop in Texas that has it, and the owner was kind enough to send more photos of the sign!