One of the photos on ebay shows a tag with Model 80759. The one I posted is Model 391.80790. The tank is the same as shown in the 1974 catalog page posted under the photos tab. These have lots of identical details, like the rear brake pedal setup. There are also lots of differences, like the tank, welded handle bars, clutch and cover. Lack of the Sears vendor code prefix suggests these were made by Manco, but not sold through Sears. Very likely a different year as well as different model.