This is an extremely RARE - OLD - VINTAGE / ANTIQUE Circa 1930's - TIN LITHO - TIN LITHOGRAPH - PENCIL CASE - MATH CALCULATOR. It is as shown and is a TIN LITHO TUBE that measures 8 1/8" long X 1 1/2" in diameter. It is called: MAGIC MULTIBOX - and is made by the ENTERPRISE SPECIALTY COMPANY - DETROIT - MICHIGAN. It is a combination PENCIL CASE and MANUAL MATH CALCULATOR. The yellow sleeve turns around the red core to do the math problems. It is in good as found condition with some wear and paint loss, and it works well. Has a Table of weights and measures, Please see all pictures, Estate sale find, Message us with any questions.