Miniature Brass Sextant, by Dollond, London, late 18th - early 19th century, with scale engraved 0-140, sliding index arm marked "Dollond London" with folding magnifier and thumbscrew lock, peephole sight, mirror, shades and folding mahogany handle, in a shagreen case, ht. with handle extended 2 3/8, dia. 2 5/8, case ht. 1 3/8, dia. 3 1/2 in.