Jewellery, Watches and Objects of Vertu to include the personal archive of Louis Osman, goldsmith and architect

An 18ct white gold and diamond lady’s wristwatch by Longines, the signed silvered dial with baton numerals, and black enamelled hands, within bezel set with single-cut diamonds, with snap on back cover on integral tapering mesh-weave bracelet strap, reverse of case and clasp stamped ‘750’, wristwatch head diameter 2.4cm, length 17cm. £600-800