Heavy duty lug and braze tube frame stretched out single tube to the neck long serial number on the bottom of the crank is SD 9635. I need help identifying this frame. Old possibly bicycle frame neck looks like it was part of a yoke from some type of vehicle heavy duty tube frame stretched out seats it's back at an angle. Vintage would like to know maker of the bike or if it's a bike or motorcycle or a trike not sure please help if you can