Flipping the photo of the register switches upside down, I read them as "Celeste," "Bandoneon," "Orchestra," Clarinetto," and "Fagotto" (which is "bassoon" in Italian). The letter "E" is particularly bizarre in this decorative type, making "Celeste" hard to read; but the same letterform is used in "Bandoneon" and "Orchestra," confirming that it's an "E."
So, I'd agree with LMM is being the likely reed set, though it's possible that it's LMH with MH being "celeste" and there being no LH or H switch.
And are those register switches ivory? If so, don't try to ship it across national borders.
But I'd like to say... this is another example in "designers of accordion grilles can't agree on which way is up." I'd like to put together a gallery of designs where the principal elements or words are pointing in different directions. I've seen examples that can be read by the person playing the instrument, the audience looking at the instrument, or someone looking at it as though it's set on a table like a piano fall-board. This is one is designed to be read in the fourth direction, looking at the instrument face on, as it stands on its feet.