It was a real rust bucket when I received it. The astute reader will note that the patent date on the nut is nearly some 30 years earlier than the supposed year this plane was introduced. I love this plane, not because it's a good one to use, but because of its description in the catalogs - it was advertised as being "boy proof. Seems kinda retro, recalling the days of old when wooden wedges held irons in place, but it actually works. The four holes are there to save a little weight.
I recently acquired a model but it doesn't fit any of the criteria.
How to Identify Stanley Hand Plane Age and Type (Type Study Tool)
Third model No with 5 point star. Check the linkages on the sole for any signs of stress tears. It's nice to now that I now am the proud owner of two pieces of Stanley crappola. All screws are captive to the plane. I don't really like this plane for the reason that its sole can go out of set during use.