So, on the bottom of the frame it shows these numbers:
MUU502
45702
26304
I know it is JC Higgins because while lightly steel wooling the rust of seen the remnants of the logo on the chain guard
It's a lightly stamped 'MOD 502'. 4570 is the Sears catalog # for a 1960 model, with regular handlebars, and a front fender light. It was a step up from the bare bones model. -Adam