The best of the vintage oddities has got to be the Majestic of the early 1930s. There are very few of these French machines still in circulation today, and this one, recently restored by Serge Bueno of LA-based Heroes Motors, has got to be the pick of the crop.
The Majestic was designed by Georges Roy, an engineer who disliked tubular frames because he felt they flexed too much. So he created a monocoque chassis using sheet steel, which also encased the drive train.
Introduced at the 1929 Paris Motor Show, the Majestic caused a storm. The Delachanal factory put it into production the next year, but sales were slow—and the story was over by 1933. As with today, it looks like pre-War motorcyclists were resistant to anything outside of contemporary norms — via Bike EXIF