An 18ct gold and diamond-set 'Extreme' quartz wristwatch, by Jahan, and a diamond-set quartz wristwatch, by Jahan

An 18ct gold and diamond-set 'Extreme' quartz wristwatch, by Jahan, and a diamond-set quartz wristwatch, by Jahan The first with circular white dial, Roman numerals, minute outer railway and sweep centre seconds to a diamond-set bezel and lugs and sapphire-set crown, later leather straps with maker's buckle, <i>European Convention mark, case 30mm wide</i>; the second with circular dial, baton hour markers, date aperture and sweep centre seconds to a diamond-set bezel and sapphire-set crown, later leather straps accompanied by maker's buckle, <i>case 27mm wide</i> Each dial signed Jahan Geneve, the first with case signed Extreme de Jahan, no. 17, the second with case signed Royal Swiss, no. 033