Coop L'Armonica Stradella button accordion

The instrument was manufactured by Cooperativa L'Armonica (commonly stylized as Coop L'Armonica), a historical cooperative workshop based in Stradella, a legendary Northern Italian town famous for its accordion craftsmanship.
Production Era: The workshop was established in 1912 and permanently closed its doors in 1975.

Design Details: Based on its visual styling—specifically the shape of the grille cutout pattern and the style of the three treble register switches below the buttons—this particular chromatic button accordion was likely built between the late 1940s and the 1960s.

I personally don’t know about full functionality but it works and makes notes.