10-inch Radius Ebony Octant, with bone scale divided 0-100°, brass index arm with tangent screw adjustment, vernier and clamp, pinhole sight, mirror, three filters, vacant bone plaque and brass pin feet, in keystone case with green-painted interior.
10-inch Radius Ebony Octant, with bone scale divided 0-100°, brass index arm with tangent screw adjustment, vernier and clamp, pinhole sight, mirror, three filters, vacant bone plaque and brass pin feet, in keystone case with green-painted interior.
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