Yeah, most of the "burned" area is just shadowing - the enamel on the wire is actually perfect when viewed under normal lighting. And yes, the winding job is a bit scraggly! It's actually the first double wound field I have seen that did NOT use the red/green enamel on the wire, it is just straight copper colored under normal lighting.
I have a few late motors with fields wound that way.
Some of them have the holes for the brush plate screws tapped metric.
Also, most of them have a plastic screw to hold down the solder lug for the second field winding.