The instrument
The Hohner Organa were distributed in various versions between about 1950 and 1970. The order of production cannot be evaluated from the accessible sources. The Organa 11 was probably on the market since 1955. Possibly there is an earlier model Organa 10.
Details
The Organa organs are blower organs in which metal reeds are made to vibrate with the air. The Organa 11 is equipped with 48 keys.