1930 Dresch Monobloc Inline Twin
Two cylinder 500cc inline, that is, one cylinder in front, the other behind it. Uses a magneto for ignition, lever shift. Has a small generator for lights, but carries no battery nor brake light. SHAFT DRIVE. A good runner. These French bikes were used by police departments as well. This example came from a German collection and bears a front fender plate that says 1929, although one listing here only shows the model being made from 1930 to 1935, so more research needs to be done.
Image courtesy Equinox Photographic