Tommaso was a brand conceived by Tom Eason of 10 Speed Drive Imports, the Florida Based distributor of Guerciotti. The brand appeared about 1985 and the frames were built in Italy by various manufacturers, then sent to the US for painting, decal application and assembly. Based on the lugs, you have what you have appears to be an aluminum or carbon fiber model. In which case it is likely manufactured by Alan or possibly Vitus. A Shimano and Campy mix indicates either some parts are non-original or that it was originally purchased as a frame. definitely a road racing frame, as opposed to touring.