Hitler visits the International Automobile Exhibition in Berlin, 1937.

https://lemmy.world/post/17072428

Hitler visits the International Automobile Exhibition in Berlin, 1937. - Lemmy.World

What’s this vehicle? Looks like an e-bike, if I didn’t knew better

It’s bicycle with a helping engine, but it’s not electric.

The thing that looks like a battery is the fuel tank. The engine is the metal attachment left and below of the center of the back wheel.

Random fact: The first motorized vehicle to drive across the USA was a bicycle. en.m.wikipedia.org/wiki/George_A._Wyman

George A. Wyman - Wikipedia

It is probably a 60ccm “Saxonette” engine. Here is an article with some bikes from that era equipped with that engine.
Saxonette (Motorfahrrad) – Wikipedia