I have had a few off-list questions regarding Stucchi. They were founded toward the end of the 19th century in Milan. They were originally known as Prinetti & Stucchi. Here is an early poster:
http://www.posters.seindal.dk/
It was also here that Ettore Bugatti undertook his apprenticeship and also may have developed his first motor designs.
They built bikes for over a half century. They also built complete motorcycles, starting in 1897 or thereabouts using a De Dion engine built in Italy. I have been able to find some race results for Stucchi motorcycles as early as 1898.
Steven Maasland Moorestown, NJ USA
PS: The omnipotent despot has a soft spot for Stucchi bikes because I believe that it was his father who owned one in his youth.