From Sport Antiques UK :: Moto Guzzi GTS Motorcycle:
This machine is powered by a 500 cc single cylinder 13 horse power engine with 4 gears. It features an overhead exhaust and side inlet valve. It also has a very advanced suspension for 1934 with dampers and the springs located beneath the engine.
This model was produced from 1934 until 1941 and only 2,952 where built. More of the less expensive GTW model without rear suspension where produced. This machine is in excellent near concours condition and rides beautifully. Circa: 1934