Cosmo is the trade name of Cosmopolitan Motors, Hatboro Pennsylvania USA. The Cosmo brand name is on several different makes and year ranges:
1980-1985? was the Amico scooter-moped, with Minarelli V1 1-spd engine, made in Italy by Testi.
2000-2005? was the Stinger top tank, with a Garelli 2-speed remake engine, made in India by Mont Motors.
The Cosmo Stinger is the same as an Avanti Supersport, both with a Garelli 2-speed remake engine, 35mph. Finally in 2013 Cosmopolitan Motors went out of business, and liquidated all of that vintage Italian parts inventory, after serving the US motorcycle community for over 50 years!