Well it was interesting learning about the history of accordion making in Italy. e.g.
http://www.fondazionesanguanini.it/images/lanterna/lanterna_80.pdf

And googling "fisarmonica" "finzi" (and adding exclusions such as "-agenzia -pasca" because finzi is a common name) turns up a few pictues of (my guess) mid-20th century piano accordions, some in a cream mottled effect, probably celluloid, including one described as "Finzi 12 bass piano accordion mod.627 made in Italy" and what looks like the same model described as "FISARMONICA ITALIANA MARCA Alberto Finzi, 120 bassi con Valigia ...".

OTOH this list does not include a Finzi:
https://it.m.wikipedia.org/wiki/Aziende_produttrici_di_fisarmoniche_in_Italia

'Ricardo Finzi' may have been a well-known player and his name was given to a particular instrument. And "Ricordi e Finzi" was a famous musical instrument seller (and maker?) in Milan so they may have commissioned "Finzi" instruments.