So I recently came into possession of another guitar. It appears to have been manufactured cerca 1970. It is in excellent condition. It is an electric guitar and is very small compared to newer models. It almost resembles a cello (possibly Rickenbacker?) The problem is, there is no means of identification. There's no name on the headstock or anywhere else on the guitar. The only thing I was able to find is what appears to be a serial number, but it's only 7 digits long! Without knowing the manufacturer I am struggling to identify this guitar. Any suggestions?