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

A diamond set cocktail watch, the small silvered rectangular dial with black Arabic numerals, jewelled movement, case signed ‘all platinum’ to the interior, the bezel pavé set with single-cut diamonds and accented with four calibré-cut diamonds, the openwork geometric shoulders millegrain set throughout with further single-cut diamonds, to a cordette strap, dial length 13mm, total wristwatch length 19cm. £600-800