Ooops sorry about the lack of info. These are used in the carving of violin, cello, archtop guitar tops/backs and are used just after a roughing gouge has done it's work but prior to the use of scrapers. Somewhere between a scrub and a smoothing plane - sort of. This one is violin sized with a curved sole and has a homemade toothed blade for use on figured maple.
This is what I call the 'squashed tube' method of construction. The body is made of some thick walled brass tube I found in a plumbers merchant, cut off less than 1 inch off the end, heated it with the propane torch and then ceremoniously hit it with a hammer to form the slightly elongated section. Sole obtained from a large old door hinge and is brazed on or rather soldered on. The wedge also forms a 'palm grip' and makes it more comfortable in use.
Not difficult to make, in fact much easier than a wooden smoother.