Can anybody help me with some info on this seat? It came off of a '58 Schwinn I picked up a while back. I have never seen one before and want to learn a little bit before I decide what to do with it. It is a Mesenger seat with a Troxel carrage bolt on the clamp. The "sissy bar" for lack of a better term comes up under the seat and bends 90* out the back. Any info would help.