Over the weekend we camped with some friends, one of them handed this to me and asked if I could make it playable.
Not sure what it is but the pick guard that came with it said Harmony, but I don't think the head stock looks right for a Harmony.
The back is nailed on with small finish nails or maybe their small metal tone bars, they are evenly spaced
It rattles when you shake it, looking inside there seems to be some spare pieces of wood floating around inside.
Now I have another winter project!