Hi, I was doing some research on a Rossin I nearly bought and came across this contact info for a person who is part of the Rossin Deptartment of Gruppo Bici, which is the company that bought Rossin. He got back to me pretty quickly with some good information, maybe he can help you out too:

Andrea Chiarini <andrea@gruppobici.it>

GRUPPO BICI srl

Rossin dept.

via pitagora 15
47023 CESENA

ITALY