 The "Super Real Series" date from late 1979 to 1982 and the open O Greco logo "Mint Collection Series" date from 1982 to the early 1990s.The "Mint Collection Series" have an open O letter in their Greco logo (an O letter with the top part of the O letter removed) and the "Super Real Series" usually have a closed O letter in their Greco logo.The Fuji-Gen Gakki guitar factory were the main maker of the Greco guitars in the 1970s and 1980s.