Manufacturer: Keuffel & Esser Co., Made in Germany
A triangular architect scale with standard measuring in: 1, 1/2, 1/4, 1/8 , 3/16, 3/32, 1 ½, 3, 3/8, ¾, 1/16-inch increments. Made in Germany by Keuffel & Esser Co. It is number 563784. It comes in the original plastic sleeve which is also marked Made in Germany. The scale is 12 ¾" long and it and the sleeve are in very good, lightly used condition.