Big Bill - Thanks for the link, good info on there, just scratching the surface, but still can't find an exact match. Using an online serial number finder comes back saying that it's either 1963 or 67, or 1970-1975, but I can't find a match anywhere. It most looks like an SB-350 or 450, but it has three knobs, and no pickup selector switch. The hardware on this one looks almost all aftermarket, so I'm thinking I have an SB, but with different tuning pegs, bridge, and pickups. Maybe. It's a strange one for sure. Going to take the pickups out today and see if that reveals any new info.
Navy Vet - what do you mean by 'fuzz tone'?