One year, I found a Dunlap ( Este) #3 sized plane.....
Well, it WAS about the same size as my other #3 planes.
While to bottom of the frog was flat, where it sat in the base...was not. And it was designed that way.
Iron was narrower than a "normal" #3's width, as it was a Metric size. The York Pitch?
Dunlap No. 3.jpg
The plane in front is your normal #3 size plane. The Dunlap is sitting right behind it. There is about a 5 degree difference in the angle each iron sits at.
SDC13639.jpg
This is under the hood. The seat slopes down towards the mouth, the bottom of the frog is flat..
SDC14584.jpg
I also stripped off all that ugly, thick, red paint from the handles.
SDC14315.jpg
Couldbe made to work, but..took a lot more effort to push along. Finally wound up selling it.