This rare 4-inch navigational instrument is signed on the large arc in engraved script, “Chas. C. Hutchinson, 152 State Street, Boston, Mass. and English.” The compass arm is also engraved in white "National Geographic Society." The sextant has a black-lacquered staight-bar pattern frame, with a rosewood handle. Locking of the index arm is by a lever on the bottom. A fine adjustment is also located on the side of the index arm. The instrument has three shades, one dark gray, one green and one red, and three horizon shades in green, red and dark gray. Index-glass adjustment is made by a capstan screw and on the horizon glass by screws. Attached to the sextant is a threaded telescope bracket that holds the three varying telescopes. The instrument has a polished brass limb with silver scale from -5° to 150° by 1 arc minute. Telescope viewing filter and adjustment screw are also included. The sextant is contained in a square dovetailed fitted wooden box measuring 7 inches X 6 ¾ inches X 3 5/8 inches tall.
COMPLETE & MINT CONDITION! EXCEPTIONAL!
Inside the box is an attached hand-written piece of paper that states: "JOHN KUSNER ASTRONOMICAL INSTRUMENT MAKER, HARPERS FERRY, WEST VIRGINIA. TELEPHONES XXXXXXXXXXXXX, WASH. FE7-0572. ALPHA INSTRUMENT COMPANY, INC. 1047 31ST STREET, NW WASHINGTON DC- TELEPHONE- XXXXXXXXXXXXXXXXX. 4-IN SEXTANT CLEANED, REPAIRED AND ADJUSTED: 15 MARCH 1963." Signed J. Kusner.