This looks a lot like my 50's era Harmony baritone. The grain pattern on the headstock as well as the bridge match mine identically. Also the nut has the same kinda overlap groove thing going on where you almost pop the strings into the groove. In my collection the nut style is unique to the Harmony.
I could be wrong, but if it is a Harmony, it would be the best $100 bucks you ever spent. I love mine. The sound is just lovely. Great playability, the neck just has an awesome feel to it.