It looks like '10' is impressed into the end of the fretboard using stamps?
It does. I don't remember seeing that before on an EB-0.
Someone has done ugly things to the fretboard and the headstock. If the body didn't look better than the neck does, I'd think that bass had been under water.
It does look like water damage. May have been in a flood and never properly dried. I'd guess the fretboard looks worse b/c it was unfinished.
Restoring to anything like it was originally would cost far more than it would be worth. $750? Tell 'im 'e's dreamin'!