I have several in my wood shop and keep them (and all chisels and plane blades) with polished mirror cutting edges...kinda anal and only need a slight honing to get an razor edge
There are similar draw knives that are looped (C) shaped that are used to make the scooped sitting surfaces of chair seats...
As always, the price depends on condition...condition...condition...
Useful tool but, as stated by others, inexpensive...
There is enough meat left on the blade to be reground, honed and polished...lot of work when they are that rough...but worth the effort...
If not interested in salvaging for use, (machine) oil lightly and use as a wall hanger...
RESEARCH: Drawing Knife is included in a group of Viking Shipwright's Tools c. A.D. 100 in the State Historical Museum in Stockholm. Tools of this type were widely used in medieval Russia for smoothing a surface after using the Axe or Adze, but no examples have been noted in medieval illustrations in the West. Source: R. A. Salaman. Dictionary of Woodworking Tools. Newtown, Ct: Taunton, 1989, page 175.