Here is a Standard Rule #37 smoother I restored. This is an enormous size smoother if it was considered a smoother. The blade is marked Upson Nut, which was the company Standard Rule merged about 1888. They were in Unionville Ct.
The blade is 2 9/16” wide. Overall the plane is 13” long and a little over 3 3/8” wide at the widest part.
To show the size, here it is next to a Stanley #36