Unidentified Old Bottle, need help!

I have a bunch of old bottles, including this one that I found today.
I think it is old. I may be wrong. There are seams down the sides of it.
There are "brush" looking marks on parts of the glass. It did not have any kind of top. I am wondering if it is a decanter? It has what appears to be the letter "s" enclosed in a shape kind of like an octagon, or a "jug" on the bottom. It has the words "patent pending" and the #5 on it. Its a pretty bottle. Almost looks like a giant perfume bottle. Has what appears to be 5 large sunflowers or sunshines etched into it on one side, and four on the other side. the center is empty on that side in the middle.
Thanks for any help! I am also going to look into my glass books!