Antique collection of three fly rod flatfish lures. Manufactured by Helin tackle co, Detroit, Michigan. Patent granted March 10, 1936. One marked F4, 2 marked F5, and two original boxes with one insert/instructions. These lures are 75 years old and are in mint condition.
Charles Helin invented the Flatfish in 1933. The plug possesses the most natural swimming movement on a slow retrieve that is possible to design. The Flatfish is lightly built to retain its lifelike action. The F5 measures 1 3/4 inches in length while the F4 measures 1 1/2 inches in length
I believe the flatfish was first.