With a little help from my friend/avatar

[wirralaccordion]

 

[dak]

I am not sure why you call this a piano accordion. The treble keyboard tray depth and corner angle rather strongly point to this being a button accordion.

 

[tcabot]

A second what dak said. This is a CBA.
The depth of the bass section suggests it's an orchestra model, i.e. treble-only.

 

[dak]

A second what dak said. This is a CBA.
The depth of the bass section suggests it's an orchestra model, i.e. treble-only.

Schrammelharmonikas have their bass buttons straight on the side, like concertinas and bandonions. A Schrammelharmonika is CBA on the right hand (B system) and has diatonic/bisonoric basses on the left.

 

[craigd]

Very astute dak, also, when I listened carefully with my eyes closed I perceived a somewhat different tonality from a piano accordion.

 

[A Tryer]

I’ve realised what I’m doing wrong, I keep my head still!

 

[wirralaccordion]

I am not sure why you call this a piano accordion. The treble keyboard tray depth and corner angle rather strongly point to this being a button accordion.

Ah but he only moves his right hand vertically ( up and down), not horizontally ( away from and towards his body )

 

[wirralaccordion]

I’ve realised what I’m doing wrong, I keep my head still!

And your right leg?

 

[dak]

Ah but he only moves his right hand vertically ( up and down), not horizontally ( away from and towards his body )

You have to watch the fingers. If a CBA player had to engage their shoulder and elbow for single notes in a scale, not much of the near-mythical CBA playing speed would remain. Here is a picture where the player even rests his thumb while playing, making clear that there is no horizontal arm movement involved:

And that's just CBA: I only said "button accordion" which doesn't rule out diatonics where there is even less "horizontal" engagement across rows.