That's an AMF early 60's middleweight frame. It has the seat stem that tightens like a handlebar stem. There should be a serial number on the left dropout, starting with a letter, a G is 57, H is 58, No I, J is 59, K is 60, L is 61, M is 62, N for 63 on the chart I use.
It has a Schwinn fork and the fenders may be the right ones. The front looks peaked which is right, but I can't tell if the rear fender is also peaked.
The handlebar stem looks added along with the rear rack. The rear rim looks like the dropcenter I've seen an many of those early 60's AMF, but the front rim looks standard, maybe replaced along with the original forks. I've never seen a 3 speed AMF of that kind, but it's possible. I see new stuff all the time.
The seat looks bad but has a crash rail and might just need to be padded and covered.