Looks like a refinish to me too. There are a few questionable things about this bass.
For one, it looks to be an L series serial #. L series were discontinued by mid-65. The spaghetti logo was phased out by '64 and the transition logo began along with 5 patent numbers displayed underneath around '64 as well. Heres two lefty '66 P Basses/necks out there now, both displaying the transition logo:
https://www.ebay.com/itm/original-1966- ... SwjIZZ0nE4https://www.ebay.com/itm/1965-1966-left ... SwjqVZFPkGIt's quite possible the bass is a pre-'66 original, but I'd have to see (correction: INSIST!) what's under the hood, heel stamping, pot dates, etc. before I'd go near it.