My dad figured it out.
It's missing a piece on top (thus the hole with screw marks), but it's a candelabra. He explains it best in the comment he left here on Friday, so let me post it here for you:
"It's the base of a candelabra.... the head of which screws into this and holds perhaps a few candle holders, perhaps also shaped as serpents. Maybe it held two candles, or four, or six... hell, maybe it held eight... a sort of Gomorrah Menorah..for the high satanic holidays"
Haha, how rad is that?! Some of you are already familiar with my dad's sense of humor and know that there is a bit of tongue-in-cheek in that comment. Ben was pretty amazed when I told him of my dad's discovery. He looked at the website where my dad found a complete example of the candelabra and was shocked at how much they were going for. The pair on the website is selling for something like $1,400. Not a bad return on something we bought for less than a ten-spot. Albeit, it's incomplete and it's not a pair, but I still think we should take it to an antique expert and find out how much it's really worth and if it was used for satanic rituals. Spooky!
Thank you to everyone for helping me figure out what this thing is! Knowledge is power!