Amazing early 20th Century National School Slate Co. chalk board. Made in Slatington, Pa. The Abacus on the top still shows signs of the red paint on the wood. This is a two-sided chalkboard. The piece measures just under 20" tall X 17 1/2" long. The slate board is 15 1/2" X 13 1/4". It has the chalk holder along the bottom. This is in great vintage shape. I see one very small ding in the backside of the slate, right at the top. You need to look hard to notice it and it's not deep or anything. The frame is in great shape and solid. The first picture is the front, the 2nd pic is the backside. Wonderful find!