If there's one thing that is not E-Z for me, it's arithmetic. I'm not sure this would have helped me in school, either. I can't even get the addition instructions to work. Where is the mysterious O that is supposed to appear in the square opening?
At at any rate, this wheel was produced in the 1930s by the U.S. Pencil Company. Just look at the charming schoolhouse scene where the little cheater tries to get the teacher's attention. I so wish some kid had written her name on the back.
I do like the old timey design of this wheel and, of course, the pinked-style edge always appeals! And see the big E-Z? Those lines are called "speed whiskers" in the graphic design world.
This is in pretty good shape and measures 9.5 inches.