Pickerel Red Head/White Black Stripe 7", Spear Fishing Decoy by Kermit Sletten (1911-1959) Sletten Manufactory Company, Willmar, Minnesota, circa 1940s-1950s. This company began in 1946 and produced fish decoys of “Solid Aluminum Die Casting” with a slit cut in for a “sheet aluminum side fin’” marked “K. Sletten, Willmar, Minn. Pat. Pending.”