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

A platinum and diamond set chain necklace, the fancy baton-link chain necklace spaced with millegrained collet set brilliant-cut diamond links, the link with partial hallmark and European convention mark, chain length 40cm, total diamond weight approximately 1.2 carats. £1000-1200