Levin Acoustic Steelstring model Klangola. 1956. #579.
Very nice flamed solid maple back and sides.
Specifications:
Non-cutaway.
Body width: 355 mm.
Body depth: 110 mm.
Spruce top with undetermined bracing.
Flame maple back & sides.
Single-bound top.
Single-bound back.
Flame maple neck with non-adjustable T-shaped duraluminum truss rod.
Unbound rosewood fingerboard.
Dark sunburst finish..
More info here: