It is a melodica made by Bohema in Czechoslovakia in the 1970's. It has 21 white keys and 15 black. I think that means it has 3 full octaves. You blow through a mouthpiece and press the piano like keys to produce the notes. Does anyone know if it has any value? I cannot read the manual as it is in Czechoslovakian. It appears to be a professional grade musical instrument. Please tell me everything you know.
Here is a link that will help. An easy search was all you needed.