Vintage Wolverine Modern Math Subtraction Tin Toy Vintage 1950's

Vintage Wolverine Tin Toy. USA made in the 1950's educational "Modern Math Addition" that tests addition skills. Made by Wolverine Supply which originated in Pittsburgh, Pennsylvania. Nice illustrative colorful lithographs that shows the teacher at the blackboard while a young girl is working on math problems. Seated behind them are 4 students at their desks. Handle on the side spins the questions and the window display flips open to reveal the answers. The toy has wear scratches, patina, blemishes and in the front by the "Math" litho there'sa dent. The mechanism lever on the side is in working condition. Measures approx. 7" long x 6" inches wide. Please see all pictures