Hohner Melodica Piano 26 Models

There is several Hohner Melodica Piano 26 models:

  1. dark grey metal one with MZ9909 (small keys)
  2. black half plastic one with MZ9909 (medium keys)
  3. black half plastic one with tube style mouthpiece
    I am interested in infrormation about second one.
    Does it have much difference with first one, except keys size?
    Does anyone has old advertisement booklets showing range of models?
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