Knife used to enhance fish for a better sale price

mackerel plow

Mackerel plow [knife]; in shape of fish; wood with galvanized metal-clad "tail" with rusted metal blade; cut out "mouth" at end of open handle, 2 "fins", an additional fin broken off, cut out heart between body and tail; cut out heart in metal and 2 other cutouts in metal possibly to represent tail fins; one side of handle has wooden inlays of 2 hearts, a 4-pointed star, 2 double diamonds, and square with 2 diamonds; other side of handle has wooden inlays of heart, 4-pointed star, 2 double diamonds (1 inlay missing), 1 triple diamond; top of handle has inlay of 4-pointed star, and diamond joined to 2 hearts. Folk art. Used to slit mackerel flesh to enhance its appearance for sale.