First is an old 6 string Gibson. Best guess is it's from the late 30s or early 40s. It has numbered frets and kind of a brownish tan body. Kind of a pretty little thing cleaned up, in a vintage tacky kind of way.

Second is an old black and white National, wood body. It has a screw in type cord and a step style body. It still has the original owners manual with it.
Both seem to be in fair to good shape, all original. Anyone hazard a guess of what the things are really worth, what type of tone you might be able to get, and anything I should check before seriously considering them? The guy's price indicates he's rather proud of them, and depending one what I've run across here, I may let him hold on to them another 40 years and then try again.
Any help would be gratefully appreciated.