My guess is that you have one of the many Stanley or Sargent jack plane clones produced after the Stanley patents expired. These often had “made in USA” cast into the base without any other manufacturers information. They were sold through hardware stores at cheaper prices. You could try to clean the upper part of the blade to look for additional names on it. These cheaper metal planes can be tuned to do a lot of work including as a long scrub/short fore or general rough work. I didn’t see a frog adjustment screw the lateral adjuster didn’t look to be the normal Stanley type and the tote was not of the Stanley type. That are clues that this was probably a cheaper plane. It probably should be considered as a user plane with little collector value but one that could be put to work with a lot of TLC.