The Beechcraft Model 18 (or "Twin Beech") is a 6- to 11-seat, twin-engined, low-wing, tailwheel light aircraft manufactured by the Beech Aircraft Corporation of Wichita, Kansas. Continuously produced from 1937 to November 1969, over 9,000 were built, making it one of the world's most widely used light aircraft. Wikipedia
I took this photo at The Kelch Aviation Museum is an located at Brodhead Airport in Brodhead, Wisconsin focused on the Golden Age of Aviation.