What kind of plane is this? Or is it a plane?

It’s probably called a corner plane. Irony.

-- A positive attitude will take you much further than positive thinking ever will.

Looks like it might be able to clean up a rabbet joint but thats about my best guess. Hope someone has fun with it

-- It's made of wood. Real sturdy.--Chubbs Peterson

Otherwise known as a Core Box plane. used to make large cove moldings. These also had “wings” one could add on, in case the molding was a might deep. yep, it is for wood. Look up in the space between a wall and a ceiling, this plane type would have been used to help make crown moldings.

-- A Planer? I'M the planer, this is what I use

That’s one of those things that I’d be tempted to buy just because it looks so cool… BUt then it’d wind up sitting on a shelf and I’d never use it!

-- Perform A Random Act Of Kindness Today ... Pay It Forward

This is a Stanley #57 Core Box plane, with the extensions bolted on. One could do up to a 5” radious circle with this. Pattern maker type of plane.

-- A Planer? I'M the planer, this is what I use

Sure would look nice in my shop,unfortuneatly you have to pick it up.They do not do shipping.

-- Pancho

http://supertool.com/StanleyBG/stan8.htm

Bandit said it, here its documented.

-- Master hand plane hoarder. - http://timetestedtools.com