It's a Bird of some kind. Maybe a Sears/Bird. All the brochures I've seen had slightly different ones , but I've never been able to ID it for sure. But the brochures only show one years models. Mine was so sprung out of shape when I got it that I couldn't tell the original shape. It has extra mounts above the rear axle mount for the shocks and a cross brace below the rear of the engine plate with staggerd holes. I added 6" in front of the seat and on the front downtubes.