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

An 18ct gold and diamond watch, by Piaget, the plain black oval dial signed ‘Piaget’, with dagger hands, jewelled movement signed and numered ‘794223’, the case back signed, stamped ‘750’ with Swiss marks and numbered ‘93418A6, 323481’, the dial within octagonal bezel of claw set brilliant-cut diamonds, to an integral textured brick-link bracelet strap, clasp signed and stamped ‘750’, wristwatch length 17cm. £1000-1500