Early 1930s Dollar motorcycle with Chaise overhead-cam engine. Compare with another model by the same French company: Dollar
"Production began with a 125cc four-stroke and the little Dollar quickly established a reputation for both durability and speed, achieving numerous race victories and setting a number of records. 175cc and 250cc models followed and the firm's success forced its relocation to a new factory at Joinville-le-Point. Proprietary engines from Moser, MAG, JAP and Chaise were used at this time, the latter being the creation of Maurice Chaise, formerly chief engineer at Gnome & Rhône. Dollar's sports bikes used Chaise's new unitary construction, overhead-camshaft engines from 1928 and the firm introduced pressed-steel frames on some of its models. Shaft-drive and rear suspension were other innovative features adopted, and by the early 1930s the Dollar range included a four-cylinder 750cc model. Sadly, production did not resume after WW2..." (from Bonhams)