Based on the swirled colors, the shape, the hobnail pattern, and the rough ends, I'd estimate this to be from a 1960s table-lamp.
While these are slightly newer (1910s-1920s), yours from the 1900-1910s period would have had a label something like these.
Well, I dug up dozens of fossils while on vacation, but not only are the fossils highly fragile, but so are the rocks they are in. What can I coat them with that won't yellow, deteriorate them, or...
Tiny poison. Must've been some potent stuff!
Today while walking around in an old bottle dump near a creek, I found this little piece. Most everything in that area ends up being broken. I guess this one survived simply because it is so small....
Reverse swirl Pepsi bottles are rare, I have some of them.