I really love the 300 Series Guild basses, so much so that I have 3: a black mahogany B301; a natural B301-A (ash body); and a burst mahogany B302. IMO one of the most collectable solid body Guild basses ever- yet they are still pretty much under the radar- particularly for lefties, as there weren't that many made. But the build quality, playability and tone of the vintage guild stuff is every bit the equal of, and in some regards better than, what Gibson was turning out at the time.
Previously Guild had been somewhat mimicking Gibson's EB designs, but as Gibson transitioned to the Ripper/ Grabber series Guild went in their own direction with both an original new body shape/ neck profile (very well balanced and comfortable) and new proprietary single coil pickups. Those fat single coils have a unique tonal character and surprisingly versatile range... imagine something similar to the bridge pickup in a Rick, add in some warm Gibson-ish low end, plus a little J top end sizzle and bite ... that's what these sound like.
Prices have been escalating, to the point where that price might not be too far out of line line for an all- original in good condition. Unfortunately the lefty up for sale has a standard J bass pickup in it (which I would never do unless forced to due to PU failure- a P, J or humbucker in there may still sound good, but it won't be the same). Replacement pickguard, and looks like some home refinishing involved as well. A cool bass in its own right, but I'd say several price points must be deducted accordingly.
. They look tremendously cool. I always assumed they were fairly compact instruments, but looking at bridge placement and reading it has a full 34" scale, I'm not so sure anymore 
