#1
what do you think a 30 year old Fender Model Gemini II Acoustic Guitar is worth... in supposedly excellent cond.
#3
In this case, I doubt the value would increase with its age. Your best bet is to look it up in the guitar blue book.

Gear:
Partscaster/Tele into a bunch of pedals, a Maz 18 head, and a Z Best cab.