My girlfriend got an old guitar from her mom who claimed its over 30 years old. Its an Arita F-30 with a signature of "H. Yoko" on the inside, and no serial #. Trying to figure out if its worth anything or any information about it at all really. Google didn't help at all. Anyone know anything?
Can't find anything on web as well. Quality acoustic guitars are often made out of good solid wood on top. If you are able to identify the kind of wood on top, it would give you an idea if it's a good or less good guitar.

Can you post pics of components? Bridge, tuners, headstock, etc.