John -
Thanks for posting. This is quite a windfall for you!
It's in very good shape. This is the basic 8" pot resonator model, but you can see that whomever bought it or made it decided on some neat extras. The fretboard binding is one, and the slightly more ornate headstock mop is another, as is the maple insert in the purfling on the back of the resonator. Also - it's walnut, not the usual maple laminate and neck. Also - a five-piece neck is uncommon on the basic model, so that's a much higher quality and fancier example than you usually see.
A couple of issues -
It needs a real cleaning. That's either a little checking in the finish (very common and not that big a deal) on the pot and resonator, or its dust and dirt - very easily removable with a slightly damp cloth. The metal fittings look a little tarnished, but that easily dealt with with some 0001 steel wool and a little mineral oil. There's a cutout at the base of the resonator - a common modification owners made when putting on a bigger tailpiece. That's all simply cosmetic.
Stromberg Voisinet built resonators from a couple of pieces of wood, and the seam between two pieces is visible, probably from shrinkage over the years. If that's a stable joint, its a non-issue.
The tuner screws are the only thing that need to be dealt with, which should be replaced - a pretty cheap and easy fix.
I think you've got a great instrument. It's all there and its a very unique looking. I wish I had the $ and the room for a third SV, but I just can't do it!
Maybe Dave or Bill is thinking about it!