Keuffel & Esser termed this a "high grade" sextant as made for the U.S. Navy. The frame is gun metal. The scale is silvered, graduated every 10 minutes from -5° to 155° and read by vernier with tangent screw and magnifier to 10 seconds of arc. The inscription reads "KEUFFEL & ESSER Co NEW YORK 4652." The serial number indicates that it was made in 1900. New it cost $120.
Ref: Keuffel & Esser, Catalogue (New York, 1906), p. 414.
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