Received this article from Motul, thought I'd pass it on...
circa 1948-52 Motul Derny 'Bordeaux-Paris' (https://www.motul.com/gb/en/news/events-racing/meet-the-motul-pace-bike-the-rebuilt-derny-bordeaux-paris-193fba6e-14cc-4be1-831f-6fdf31773680)
Powered by a Zurcher 98cc deflector-piston two-stroke single engine with an integrated clutch and two-speed gearbox of antiquated design.