Ebony frame with brass index arm and fittings. Brass stop for the index arm. Inlaid ivory plate on the crossbar, ivory plate on the back of the frame. No tangent screw; clamping screw on the back of the index arm. Three socket shades (red, red, green). Index glass adjustment by screw, both horizon glasses by screws and levers, wing nuts and clamping screws. Sight vane with two pinholes and a swiveling shutter, back sight vane with one pinhole. Ivory pencil head, pencil missing. Decorative engravings on the lower part of the index arm. No box.
