Buck Brothers adjustable block plane. This is similar to a Stanley with the addition of a lateral adjustment lever.
Japanning is intact, but the are paint marks along the side where it seems to have been used on a shooting board or against a painted object.
Mild rust stains but no pitting.
Blade has been flattened and sharpened to a 20 bevel. This should be an amazing worker right out of the box, maybe requiring minor fettling based on your use.