Hi Giovanni,
Alessandro Anzani started in 1907 with his firm La Société des Moteurs Anzani producing one and two-cylinder engines for motorcycles of 300 till 500 cm3.
The first aeroplane engine he built - a 3-cylinder of 25 hp - was ordered in April 1909 by the Caudron brothers.
No two-cylinder Anzani engine for aircraft use was ever made.
But sure, this old Anzani is a real beauty. Interesting is that the number of the brevet (patent) is on the cylinder. I could make out the number 5000.
Cheers
Kees
Source: http://www.hydroretro.net/etudegh/moteurs_anzani.pdf