Can anyone match this box to a catalogue to date it more precisely?
... I'll look through what I've got.
But (for now) on stylistic grounds, I'd reckon it's from ... possibly the very beginning of the 1930s - "circa 1930" might be a reasonable description.
Having come across a stash of American single-sheet catalogs that I'd almost forgotten I had, for Paolo Soprani sellers between 1925-6 and 1941-2, I can now say that the metal grille on yours is a style that first appears in one of them dated March 1933 Paul, and it's still illustrated in my subsequent one "from Oct. 1934 to Dec. 1935".
This No. 56 piano accordion is from that March 1933 catalog and has the same design along the front of the grille, and the same chequer banding as your G/C/B, as also do No. 22, No. 50, No. 52 and No. 54 in it:
There are also models of with similar floral decoration to the G/C/B shown, next to No. 54, illustrated here from the (sale-price!) May 1933 catalog:
So I'd say that makes 1933-4 a likely date.