Gillet Herstal was a Belgian manufacturer started in 1919 with the production of motorcycles. They ended production in 1958. The first Gillet motors were two strokes with a displacement of 300cc. In 1920 came a 750cc model, equipped with a MAG V-twin. In 1922 a 1000cc model came on the market. Meanwhile they continued to improve the two-stroke engines. In 1922, a 350cc model with a rotary valve arrived. After the “round the world” adventure of Robert Sexe and Henry Andrieu in 1926, this model was named "Tour du Monde". After 1945 they built two strokes and a 720cc- parallel twin. By 1951 Gillethad a range of 18 models. Perhaps too much because all these different models (two strokes of 100, 125, 150 and 250cc, four stroke 250, 300, 350, 400 and 500cc) were expensive to develop and produce . Until 1955 the model range was even extended. From 1955 , however, it quickly deteriorated. In 1958 motorcycle production was discontinued.