Casotto 50 was published on the Oy Harmonika’s 50th anniversary year. The company’s actual gala concert was held in the Kouvola City Hall ballroom on September 19, 1982.
In the last accordion models, Oy Harmonikka used ABS plastic in the body in addition to celluloid, which stands out particularly well in this model. As it ages, the color of the white celluloid turns yellowish, but the color of the ABS plastic does not change.