This telescope has an achromatic objective, a two-draw brass body covered with brown leather, and an amber-colored solar filter. An inscription reads "U.S. NAVY / OFFICER OF THE DECK SPYGLASS / POWER 12½ / KEUFFEL & ESSER CO N.Y. / N 3224."
The U.S. Coast & Geodetic Survey acquired this instrument in 1920 and transferred it to the Smithsonian in 1929.
Ref: Keuffel & Esser, Catalogue (New York, 1921). P. 413.
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