It's a late 50s to 60s Harmony. Pretty shitty guitar (no truss rod adjustment for example; no binding or top/back endgrain treatment). The acoustic sound is very midrangey (a typical low end blues box) - I like it for that, but it's no dreadnaught. It came to me refinned with way too thick poly, which sucked all the bass it did have out of it; sounded like a tin pot. I stripped and stained it, finished in Tung oil. I also had to reglue a few bits (back to the side at the butt end). Overall probably not worth the work, but I couldn't bring myself to hack up a nicer guitar for this project.
The neck is a nice vintage V (like the new Loar guitars, but not as pointy - either Loar exaggerated the shape or 2+ sanding/refins on this one took the edge off, litterally). Very comfortable to play, but I do wish the high E was not quite so close to the edge of the board. I used to own a Loar as well (higher end nitro finished one), but sold it off. It sounded a bit fuller in the bottom, but there was something about the midrange and treble that bothered me. Plugged in, this thing has bass for days. I always planned to make the typical Gibson LoZ circuit as an external stomp box (to preserve what body the acoustic tone does have), but haven't gotten around to it yet.
Original (to me) condition:
http://grannygremlin.com/images/nonwebpics/projects/Harmony%20Archtop/Before/ (very pretty in white, but sounded like poo).