The MS.560 was a single-seat aerobatic trainer first flown on 1 September 1945. This prototype had a 75-hp Train engine and a retractable tricycle undercarriage. Also F-WBBB. On the right, F-BBGB is an MS.571, developed from the MS.560 through the two-seat MS.570 and having room for a third seat or bench in the back. Only prototypes of these aircraft plus a few more MS.571s were built. On the left is an early MS.472 Vanneau. Photo from: Bibliothèque nationale de France - Gallica