It's a score as a player at $300, even with that messed up bridge. $30 Fender Pure Vintage bridge, gold guard, ashtrays, get rid of those ugly strap buttons, and you're set. Those were well made instruments (though the electronics left something to be desired). The equivalent today would be the Vintera line, which are around $1,000 new – though the Vinteras have better electronics.
To "flip?" Don't bother IMO. Not worth your time and investment to possibly make a few hundred bucks at some unknown point down the road. If you ran a guitar shop, with the infrastructure to present and sell, the shop space to let something sit for possibly years, and the mechanisms in place to ship an instrument easily and quickly, sure. But as just some guy, unless you are easily going to double your money, don't bother flipping gear, IMO.
I played the same model last year in a local used gear shop. It was a stellar bass, but overpriced at $800 in just OK condition. I'll bet it's still there.
My main bass for 10 years had the same body, but with an AVRI rosewood board ("1962") neck. Still one of the best basses I've ever played.
Bottom line: If it was in my city, at that price, I would drive out to buy it right now, before eating dinner. As is, it's a maybe at $500, a yes at $400, and a no brainer at $300. Fixed up, it's a $600–$700 bass, in the real world.
That said, I'd be buying it to play...and immediately putting a clear coated gold anodized aluminum guard on it. It would become the alternate to my main bass, a blonde AV '58 Precision (same basic specs, just American made, and blonde).