It’s the only video I could find with this instrument.
If we could find the patent, we could have a look at the drawings and have more information on the position of the reeds / reed plates: reeds in horizontal position or in vertical position (= French accordina).
My guess would be the reeds are lying flat in horizontal position, but only guessing.
The bayanita-43 name could be referring to a year of patent application, 1943 (?), being the same year André Borel made his chromatic harmonicon patent application in the USA.
Because the number of buttons seem to be 45, and not 43.
I’ve read online a specimen was sold at an auction beginning 2015. There it was called a Hohner Varieta 45.
But the Hohner company has no traces of a Hohner Varieta 45.
Another guess is this instrument is made in the Ukraine (mass produced ?) or a Russian made. It looks to be a cheap mass production music instrument. But maybe it was not a success and only a limited number was made?
Maybe some more videos and info will pop up online.