I can only comment on the pic's you've provided but, without pic's of the interior, I can tell you what I observe ---
You have a Italian made US import from the Mid 1940's to late 50's
This one should be a 4 reed treble & 5 reed bass
The maker was the Italian firm Elio Gabbanelli that imported brand names such as, Noble ,Reno and of course Gabbanelli.
These were well made accordions for the time period and today in fine shape will out perform mediocre Chinese and German accordions made today.
From it's cosmetic appearance it looks low milage as it is still white and not yellowed.
The reeds in these old Gabbanelli's were a combination of machine and hand fitting and tend to hold their tuning for a half century. Your box might only need valve attention,cleaning and some treble & bass lube.