OK, a friend brought an old bike into the shop and we are trying to figure out just exactly what it is we've got. It had belonged to his much older brother who rode it to college classes late '40s.....wasn't new then, however. It got taken apart and thrown in boxes back in the early '50s and there it sat until a couple of weeks ago. We have been going thru the boxes and assembling the bike as best we can in order to figure out just parts and pieces we have or are missing. Here's the progress so far: The engine is a Sachs M98. From paperwork we found on the net, it appears the serial #puts the engine as a 1929. ?? It is a two-stroke, 2-speed motor. Hand shift on right hand side of tank. Clutch appears to have been hand operated, also. It is a kick-start motor, not a pedal start. Only ID we can find on the chassis itself is this plate: Not sure if it is an actual Sachs built bike or not. Or if this Streifthau Mfg, in Ohio, purchased the Sachs engine, as many companies did back then, and then built their own chassis? Not much info on Streifthau or than about some amusement park. THere does seem to be a fair amount of info on the net on the Sachs and thes older bikes, but its typically been in Dutch, German or even Russian!! Any ideas on just exactly what it is we got here???