This model has 27 keys and the notes are from g to a2. Mouthpiece attaches the different side from present Melodions.

These are the back photos

Each mouthpieces don't have an O-ring. And the Short-one is colored chrome. The shape of the Long-Pipe-one is different. It's separated from two ones.

This photo is the about all contents. The bag is also different
The Air-Box made of metal. The sound is fatter than the other KENBAN-Harmonica.