Sorry, but old and rare do not always add up to valuable. That is not a valuable guitar as it was clearly not a special model when it was made. For example, it has no binding. An old Gibson or Martin archtop would have some value although old archtops are not as collectible as old flattops.

The picture of the peghead was a little blurry and not at the best angle. Is there anything at the top of the peghead where one expects to see a brand name? What about on the back of the peghead above the tuners?

Your best bet is to contact a vintage instruments store like Mandolin Brothers or Elderly Instruments and speak to someone there. They're going to want digital photographs but they will have to better than the ones you posted on Facebook.