During the last decade of Oy Harmonika’s operations, a lot happened. The factory’s 50th anniversary was celebrated in many ways in 1982. During the anniversary year, casotto 50 was released, which was the factory’s celebratory model, and two years later, in the spring and summer of 1984, Kuningas-Cassotto 6 and Kuningas-Cassotto 5 were released. The number after the name indicates the number of rows in the treble. The basic body of the Kuningas-Cassotto was the same as in the 50th anniversary model, but the exterior design was different.