My Sekai Sprint seems different than the others I've seen. It has a 3 Pin Seguino Maxy chainring and the cranks are cottered but I wasn't able to find any markings on the cranks. The serial number I got off of the bike was ID12566. It was stamped on the side of the vertical bar as there was nothing on the bottom like I've seen others. Is the Seguno 3 pin even that good and is it the original by chance? Any input would be great!