Levin Acoustic Steel/Nylon string model 120. 1956.

Earliest one known! Specifications: Non-cutaway. Grand Concert size: Body width: 380 mm. Body length: 480 mm. Body depth: 98 mm. Fingerboard width: 50 mm. Scale length: 650 mm. Spruce top with undetermined bracing. Flame maple back & sides. 4-ply bound top. Single-bound back. Mahogany neck with non-adjustable T-shaped duraluminum truss rod. Unbound rosewood fingerboard. Rosewood bridge. Nickel plated strip tuners with white plastic buttons. Sunburst finish. Ten year warranty. This model was constructed to be used with either steel or nylon strings. Introduced: ca 1955 Earliest known example is this guitar!: 1956 Latest known example: (1967).
Model info here: