Ca. mid to late 1930s
Ancient exotica. WOW! A supercharged, 3-cylinder two-stroke engine with at 3 Amal carburetors, 3 small superchargers, which share a drive with a dynastarter. The engine is a 'flat' triple, with 3 parallel bores and water-cooled cylinders.
Found here: The Vintagent
Photo Credit: Hockenheim Ring Museum