Stacked keyboards!?

[Ffingers]

Interesting, but to what end?

 

[Dingo40]

Well spotted, Ffingers!
I wonder what that is?
Bur wait, it's not unique!
See here:

cesarin a puro acordeon youtube - Google Search

There could be a whole tribe?
BTW, he also sometimes plays a "normal " PA.
These are the notes with above clip: is there an explanation here? ( I don't speak Spanish)

GASPARIN Y CESARIN, FLORIDA VENTANA DE GRANADA.flv
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2010
Jul 31
SUBIMOS ESTE VIDEO DE ANTOLOGÍA DE DOS AMIGOS. GASPARIN SIEMPRE ESTARÁ CON NOSOTROS POR TODO LO QUE DIO PARA EL ACORDEÓN EN ARGENTINA. RESCATAMOS EL VIDEO DE LA PAGINA DE ACORDEONISIMA.COM A QUIENES FELICITAMOS POR CONSEGUIR ALGO INEDITO Y RECOMENDAMOS SU SITIO EN: http://www.acordeonisima.com.ar TAMBIEN SE MUESTRA EN EL VIDEO DOS ACORDEONES DE DOBLE TECLADO HECHA POR LA FAMOSA FABRICA DE ACORDEONES FUNDADA POR ANCONETANI QUE TRASCENDIERON LAS FRONTERAS DE ARGENTINA POR SU CALIDAD DE SU SONIDO Y SU FABRICACIÓN ARTESANAL INDIVIDUAL UNA POR UNA.

 

[Ffingers]

I get the gist of the notes, Dingo, but they do not indicate the 'why' of the double keyboard.
The site acordeonisima.com appears to be defunct.
Curiouser and curiouser

 

[Dingo40]

Here's another clip showing the stacked keyboard in use.
Here the stacked portion appears to be unused altogether; could it simplify be a dummy?
But why?
I hope someone can tell us!

 

[Squeezebox Of Delights]

How fascinating! I design silly little concepts for impractical accordions all the time, and have devised several double keyboard designs, but I never thought they'd actually be a real thing!
This old drawing of mine comes to mind...

 

[Waldo]

I want one!
I dig the register switches (and the metalflake).
Dingo notes he only plays the outer keyboard (which suggests the inner 'board is a fake). While he uses the bass side when playing the "normal" PA, he never uses the bass side when playing the stacked box. Are there even reeds on the bass side (to lighten it up)? This all leads me to believe the whole thing is showmanship.
I still want one.
Tom, Did you see one of these at the Accordion Museum?