Cool guitar! I would clean it up the best you can, take the strings off and clean the fretboard with baby wipes to get the gunk off, and apply lemon oil if it seems dry.
Then take it to a guitar repair shop and get their input on the frets. It's possible they can recrown the frets instead of replacing them completely which is much more expensive.
I've been quoted ~150 to recrown the frets to give you an idea.
As far as value, I'd suggest finding the serial number on the guitar and figuring out the exact model and year of manufacture. Then find similar guitars for sale on reverb.
Cheers and Good luck!