Definetly Sears. Im redoing one now. Looks like the sissy bar was cut off, or might be a later model. These had a 2 speed "Trans" that bolted in the two holes in front of the scrub break (kinda like a jack shaft) If you go on youtube you can see almost your exact one popping wheelies! I will add a pic of a near mint one from around the early 70s. But I think yours is a later model.