It looks like it could be a Harmony or Silvertone or any number of other f-hole guitars of the day which all looked pretty much alike. Unfortunately the beginner, intermediate and even advanced models of many of these instruments might have only subtle differences which would make them difficult to identify via your photo. The guitar pictured does not seem to have any fancy features like special inlay on the neck or binding around the fingerboard, or an especially exotic tail piece or pick guard, or even a headstock inlay that had any sort of unusual or identifying mark. There doesn't even seem to be any kind of distinctive finish either. It's hard to tell by the picture but it looks like the guitar is painted or finished in a dark color. Finishing an instrument with a painted finish or dark finish usually meant that the instrument was not of great quality but compared to today's standards any instrument from that period, even bottom of the line examples, is a find and a treasure. The tail piece is the only real identifying give away. If you could get a clear shot of the headstock shape that could tell you if it was a Gibson. They have a distinctive cut. Hope this helps.