Spencer Barrett & Co. Ebony Octant

Description:

Spencer Barrett & Co. Ebony Octant, London, 11-in. radius with bone maker's plaque marked Spencer Barrett & Co., London scale calibrated 0-105, brass index arm with vernier scale marked 0-20, sighting pinnula, horizon mirror, three shades, fitted in a keystone box with label stating in part, Eugene F. Medinger, Chronometers.
Estimate $300-500

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