This is rare damage, but it just goes to show you that these planes can be damaged anywhere and it's just good practice to examine them thoroughly before you buy. Chuck Panno says: This frog is secured to the cross-rib via two screws that are oriented horizontally. I intend to eventually format the data into a more usable format, but for now I want to put it out for reference and feedback. You might notice that I don't include the weight of this plane here. A cracked tote is another fairly common flaw found on these planes.
To find out more, including how to control cookies, see here:
How to Identify Stanley Hand Plane Age and Type (Type Study Tool)
Stanley planes that show this 'handiwork' must have belonged to transitional woodworkers, where the line between master carpenter and ham-fisted hack was but a mere hammer away. This was the supposed appeal of these planes, that they are lighter than the iron planes. Good idea, Stanley, but you didn't quite get it right. The brass depth adjustment nut used on this plane is different from all the others. But the gaining popularity of Spiers' product line eventually was noticed by the toolmakers south of Ayr, down in merry ol' England.