Thanks, this is a great help! The F and F# on the top left side ( the side with the serial number ) should certainly be exchanged. Can you check again? It helps to read D# as Eb and A# as Bb, ( even though they sound the same ).
Alltogether an unexpected layout ( I was wrong ). It looks a bit like a Stagi Mini ( lowest C on the left side ), but it should certainly be one octave up.
If I am correct this time, layout and sounding notes don’t correspond to a treble, but to a piccolo! I would certainly miss a Bb on the right side.
Somehow I prefer the layout of my 20-key Lachenal with the low C on the right side ( may be because I am used to it ;-)!?