Marx Dough Boy Metal Wind Up Tank Tin Litho Wind Up Key 1930's No Key. We found this at my uncle’s house when we cleaned it up. I am sure he and my dad played with it when they were kids, but it looks to be in pretty good condition, as you can see from the pictures. I don’t have the wind up key, but when I move the wheels the guy pops out of the top and back in. The gears appear to all be working, so I am guessing this would work if you had a key. Thank you for checking out my ...listing, and have a great day!