Hi everyone!

I'm new here (this is my first post!) I had a question which maybe someone could answer:

I was in this antique store and they had this great sounding guitar for sale. It was a hollow-body electric. It was an Ibanez, and had the word either "Duostar" or "Dualstar" along with 'Ibanez" on the headstock-- which I am assuming was the model name. The owner said it was from sometime in the 1970s. He was selling it for $550, but I can't tell if that is a good or bad deal, because...

When I got home I could find nothing anywhere on the Internet about this particular Ibanez model!

Has anyone ever heard of the "DuoStar" or "DualStar"?

Any help would be much appreciated!