This is a cleaned Defiance #1204 Smoothing Plane. It’s been sharpened and tuned and only lightly cleaned. This is a great low cost smoothing plane.
The knob and tote are original with most of the original finish missing. They could be lightly sanded and given a few fresh coats of finish or just waxed and used. It up to you.
Japanning (or actually grey paint) is original and is not that great. Stripping and refinishing would not be that difficult or you could just keep it oiled or waxed and just keep using it.
The back of the blade has some minor pitting so it’s been sharpened with the ruler trick. A little elbow grease may get past the pitting or just continue to use the ruler trick and it will continue to serve you just as well.