I have a series of six 10"x 14" cardboard 'Plaks' that were manufactured by the 'Youngstown Pressed Steel Corp'. They're comprised of an 10"x14" thick cardboard background piece, with cut-out characters that are painted or colored, then glued to the background. The characters I have are Thumper, Bambi, Flower, Pluto, Donald, and of course Mickey. They seem to be from the pre-WWII era. Mickey is wearing a uniform and helmet, and is walking in front of a tank with shell bursts overhead. Four of the Plaks have been colored and completed, probably by my brother, who was born in 1935. Has anybody seen this type of animal before? What might they be worth? Thanks!