Antique Thacher's Model 4012 calculating instrument by Keyffel & Esser Company, New York. Slide rule cylinder in fitted mahogany dovetailed case, serial number #3596, with the original instruction manual dated 1914. 6 1/4" H x 23 3/4" W x 6 3/4" D. Provenance: A.R. Dickey Estate, Knoxville, TN Condition: Some wear and scratches to case. Some yellowing to cylinder.
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