USA, circa 1900

With original wood box, no magnifier

Made by Keuffel & Esser Co., New York Patented by Edwin Thacher, C.E. Nov. 1st 1887

Marked: Model: 4013 Serial no: 4377

Winged lion trademark Slide rule calculator, wood with laminated instruction. The 4013 model is the upgraded model from the 4012, the mahogany box is in good condition with no scratched names or other added markings. Missing is the magnifier that could be attached. 7,000 were sold.

22" long x 7" diameter

Condition: Good; presented evenly, some yellowing.

SHIPPING: Buyer is responsible for shipping arrangements.