Hohner Morino IV M in action 🙂

[Dingo40]

Another:

Incidentally, you've never seen anybody with access to so many different accordions

 

[Tom]

That is a very unusual Hohner.

 

[Morne]

That is a very unusual Hohner.

That instrument represents the last of the Venanzio Morino-era Morinos (i.e. when the man himself was still at Hohner, but not necessarily having a direct hand in making them). The earlier generation Morino M had a single stripe down the middle of the grille and it had the rectangular bass layout. They came in colours (white, red, grey) and could have the pearly keys or off-white, slightly striped keys. There was also an alternative older grille design (example of a red one with the different grille on ebay: https://www.ebay.com/itm/Akkordeon-...rn-gestimmt-und-uberholt-Casotto/124280589814).

The later generation Morino M's (Giovanni Gola-era) have three stripes down the grille, trapezoidal bass and, as far as I've seen, were always black.

Another defining characteristic is the older M's had an actual (wooden) bass cassotto design which dates back to even before Morino joined Hohner. Example here: https://akkordeon-museum.ch/morino-ft-geneve-ca-1925/

I don't have a definite year, but I believe that distinction happened around mid to late 1950's.

 

[boxplayer4000]

Dingo40.
This is my favourite Morino period. There's endless discussion to be had on which period was best but those videos make a strong case.

Morne.
I had never seen the 1VM in the link you posted. That's the one with the Morino 1 grille and the 1VM body. Thanks