Ah. Broken off the front. I see now. And then cleaned up a bit. Does that often happen to those kind of planes? And (OK) what is the original for -- I see the blade sticks out all the way to the edges, so ... is it a shoulder plane? for the shoulders of tenons & stuff like that?
No, I went to blood & gore & it says it's a bull-nose rabbet plane. Which actually leaves me no more the wiser, except with a sort of horrifying animal image. A rabbet plane, I should think, is useful for cutting those narrow grooves (or are they dadoes?) on the edges of the piece of work. I think that's what a rabbet is. Maybe a rabbet is just a dado. But anyway, I don't know why you might want it to be bull-nosed.
AND, B&G says: "The toe section can be removed completely from the plane so that it can be used as a chisel plane. Stanley, in their tool propoganda, claimed that with the plane configured as a chisel plane it was useful for the removal of dried glue. There are better ways to remove that than to use this plane. However, the plane does function nicely as a chisel plane and is particularly useful when working rabbeted frames, where the stiles and rails join." So, perhaps it isn't broken but the "toe section" has been lost? In which case it might be fairly described as "expertly machined"...
question girl tries to look things up but she doesn't understand the answers.