The product is a vintage Speedo Sharpener made by Central States MFG in St. Louis, MO. It has a hand-crank tang that turns well and easy. The sharpener is an original antique vintage made in the U.S.A. with licensed MRFS. PAT. NOS 1558194. It has a wood handle and is designed for right-left (R-L) dexterity. The type of stone is sharpener. Missing  back plate see photos works well