The Airline H78 Thinline was built for the Montgomery-Ward company by Harmony from 1965 to 1972, as a re-branded version of the Harmony H78. Indeed, it seems that the only difference is the head plate and logo!
Harmony, purchased by Sears-Roebuck in 1916 and owned by them until 1940, was at one point by volume the largest guitar maker in the USA, which also meant in the world.

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