I wanted to start a history thread on One Off or other bikes lost from the past.
Pictured here is Maurice Fournier on the twin-cylinder 2976cc Buchet. He won many races on similar machines and set the world speed record over 10km on the 12th April, 1903, averaging over 89 km/h.
Sourced from the Bibliothèque nationale de France by Isabelle Bracquemond

Feel free to add to this thread. I love obscure motorcycle history!