DescriptionAdvertising ink blotter from Keuffel & Esser Company, New York and Hoboken, N.J., April 1924. Printed paper laminated to blotter paper, 3-3/8" high x 6-1/8" long. "Accuracy by Test, Workmanship by Use!" Depiction of a transit at the left with calendars at the right: April centered with smaller calendars for March above and May below. Refers to Circular No. 3660 for engineering instruments.