mystery harmonica

Does anyone know anything about this harmonica? Made by Hohner, “Sonny Boy” seems to only play 7 notes on the blow and another 7 on the draw, tuned like this:



Look like this one?


Thinking they were made in the '50s, but that’s a guess.

Looks like a Tremolo Harmonica to me. You can probably find out more at There are several guys there that are into vintage harmonicas.