Take what i say with a grain of salt, I am no expert but i have seen some Klein catalogs from this era. I believe this is an early Klein "team". 1980-83 or pre the Quantum name. Very, very expensive & exotic bike at that time. Klein's from that time were all semi-custom. Most had the top-of-the-line Huret rear mechanical & Modolo brakes, but anything available was an option.