Stanley, along with other manufacturers, produced unbranded planes for resale through hardware distributers. The similarity of this plane to early Stanley’s makes me believe you have one of those. The twisted style lateral adjustment lever was used on the cheaper lines of Stanley produced planes and the shorter knob is typical to the older planes. The Stanley Sweet heart logo indicates that the original blade was replaced at some time. Since the plane is not a typical Stanley line it can’t be “typed” the same as heir regular line.
Unlike many collectors, I don’t worry about “type”, especially since many parts were shared across types as changes were made until old style parts simply ran out on the production line. Just appreciate the quality of the functional abilities of the tool and have fun with it.
I managed to get in touch with Eric of Hand Tool Rescue. He had this to say:
I think what you have here is a Stanley No 8 (Type 7) body and lever cap, with a Type 12 blade, and an early Union plane frog (see attached). It was probably added on not long after production as Type 7s were made from 1893-1899 and Union did not start making planes until 1900. What you have is definitely quite old and just the frog itself is rare.