SG prefix = Série Gémeaux singles. French Discodis distributed issues usually have AZ 10 ??? number and SG number. In such cases add the AZ number to label, then add Série Gémeaux and SG number to series.
French label established in 1963 by Lucien Morisse. For some activities it is just known as AZ (i.e. distribution and marketing). Although Disc'Az has acted as a distributor itself, marketing strategies changed over time, and the label has been handled via many other distributors, including: Disques Vogue (1963-67 mostly), Discodis (1968-7?), Musidisc 1980s, and was then bought up by Universal in the late 1990s.