Sextant.
Casing made of cast and pressed aluminium with textured black paint finish. Rubber eye piece covering and 2 'bumpers' running parallel along top edges of cast casing. Three lenses/filters made of transparent dark and colourless plastic. Non-magnetic white metal component slots into cast portion of casing behind light bulb protected by transparent plastic disc. Leather hand-strap fitted with iron alloy buckle and attached with springs screwed to cast side of casing. Circular cover for interior workings, on pressed side of casing, made of opaque ivory-coloured plastic. Spring steel fitting attached to same side apparently missing contents. Scale on same side, black with white increments, made of brass, screwed to casing.
Two small plaques attached to cast side of casing read: "Patented, U.S. D132977, Patents Pending, United States, Great Britain, Canada", "U.S. Navy, Sextant (Bubble), Type A-12 Serial 2627-43, Contract No. No A(S) 149, Mfr's. Drawing No. 11734, Link Aviation Devices Inc."
Case:
Wood construction, covered in a coated ribbed khaki-olive green fabric. Moulded leather handle painted similar colour. Fastenings are iron alloy with dark brown-black finish: hinges, flip latches, central latch with lock, handle attachments. Plaque under lockable latch reads: "Patented, U.S. D132977, Patents Pending, United States, Great Britain, Canada", "U.S. Navy, Sextant (Bubble), Type A-12 Serial 2627-43, Contract No. No A(S) 149, Mfr's. Drawing No. 11734, Link Aviation Devices Inc." One rubber stopper remains screwed to exterior lid end with hinges. SIngle iron alloy screw in centre of case bottom.
Customised interior with wood blocks to cradle parts, covered in dark ochre coloured felt. Ruber stoppers are screwed to 2 blocks attached to lid to pad contact with sextant. Two blackened metal (non-magnetic) clips are screwed to inside of lid, but hold no components. iron alloy glide is screwed to the inside of top and bottom to hold lid open.
A wood bloack attached to inside of lid contains 2 spare bulbs (3 additional holes are missing bulbs). A wood block at back corner of case bottom contains 2 spare circular opaque ivory-coloured plastic covers for internal workings of sextant, and a spare non-magnetic white metal component. A non-magnetic white metal vial containing four sharpened leads is stored with spare plastic covers. Semi-circular iron alloy straps screwed into place brace the three other corners and appear to have previously contained components; the casekey is tied to one brace with string.
