I have this Alvarez ASG4 on e-bay right now. I guess it's not really vintage, in the sense of being old, but only in the sense of being rare and good. Alvarez hasn't made a lot of electrics, and got out of the business.
This one is about as nice as it could be, for its age, which is 3-7 years (can't tell for sure from the serial number).
Mike