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

A diamond set lady’s wristwatch head, by Rolex, the signed silvered oval dial with black Arabic numerals, jewelled movement signed ‘Rolex Prima’, 18ct yellow gold case bearing UK import marks for 1919 and maker’s mark ‘AS’, with scroll engraved band, wire lugs and millegrained rose-cut diamond set bezel, dial dimensions 21.5mm x 18mm. £550-600