Hi all, was given this vintage looking gem from a friend a few years ago with the intention of my father cleaning it up and restringing it. We have no idea how old the guitar is and cannot find a serial number on it at all. Looks possibly 70s or 80s. Would love some help if anyone can identify it’s model, serial number and year of make! Thanks 
It’s a bit difficult without a serial number, sorry!
Have a look at the back on the rear of the trem cover for a stamped serial #.
It looks like an SE 604 from about 1983/4, Korean made. It was rebadged as the Arbor Series from about 1985 but kept the same model number.