I've had this bass guitar for a few years now, and the plate on the back says Harmony. But when I look up the guitars name, I find nothing. Almost as if the Guitar doesn't exist. It even has a few autographs on the back. Here are a few pictures, if anyone can tell me what it is, It'll be greatly appreciated.

better pics would help, or at least give more info. like serial number, any writing on neck plate, or headstock.