Simoncini has a long history. According to a UK importer (http://www.cyclesclements.co.uk).
"Simoncini - a small family firm based in Tuscany in the heart of Italy have been making Cycle Frames and Forks of the highest quality since 1949.
Previous riders of Simoncini Frames have included Mike Gutman, Swiss Cyclo Cross Champion in 1983, and Kohut Slavomir, Polish Road Champion in 1999."
Article taken from Road Bike Review