Moorson Super Twin Tube
The 1938 British rule against putting the name of the bike builder, or the model, on the bike caused some interesting side effects. One of these were the unique frame configurations that allowed the bike to be identified in a photo. The Moorson could be identified by the dual tubes that replaced the usual single top and down tubes. While there wasn't any performance advantage, that hasn't stopped other manufacturers from picking up the idea from time to time. One that comes to mind is the Colnago Bi-titan
Steve in Peoria