Motosacoche

Around 1900, the Geneva brothers Henri and Armand Dufaux designed an engine that could be fitted like a bag into the frame of any bicycle. The approach was so successful that industrial production of the «pannier motor»—hence Motosacoche—soon began.

Depicted on the poster, which was most likely printed in 1903 or 1904, against a dramatic backdrop is the company's first model, the Type-A engine, accompanied by a bare-breasted messenger of heaven who—presumably to ennoble the product—is meant to evoke Hermes, the messenger of the gods.

possibly also of interest – especially in terms of Hermes, which wasn’t very good here either:

Brunnen–Morschach Electric Mountain Railway