A Brief History of the Marque
Manufactured 1954-1958 
In 1954, the Guiller company divided. René Guiller, the founder, created a new company using his own name, and his brother Pierre's two sons established Guiller SA.
René produced motorcycles with engines from AMC, Ydral and possibly other engine suppliers.
A 1955 model had a horizontal AMC 125 twostroke, and there were the models RG Tourisme 125cc and RG Gentleman 175cc both with Ydral two-strokes, swing-arm rear suspension and Grazzini telescopic front forks. The 1955/57 RG115 had a 175cc Ydral engine.
An unverified listing exists of a 1959 moped with sports styling and deeply valanced guards, and there is reference to a 250cc OHC model in 1958-59.
Three new models named Corsaire were announced for 1956, the RG130 (rigid), RG133 (plunger) and Sport (swing-arm suspension). All were fitted with the AMC Isard 124cc two-stroke engine. These did not enter production.
Sources: moto-collection.org, et al.
1. Some sources give 1956 date of closure, but 1958 seems more likely.