Hohner Morino IVs in first class condition.
The Hohner Morino IV was designed with a tone chamber, called a cossotto. This is one of the trademarks of the Morino, which is a high-quality, top-of-the line instrument. It is built for both orchestral and soloist playing, and was designed with 41 treble notes, along with 120 bass. To reduce shrill tones, an additional resonance chamber was included in the master-crafted accordion, which helps to amplify the warm, rich bass.
Truly one of the best accordions ever made.
Listen to this accordion on Youtube: