A Rare Silver Duo-Dial Flared Rectangular Jump-Hour wristwatch, Rolex, 'Prince', Ref 1491, 1930

rectangular nickel lever movement, Rolex Super Balance, 15 jewels, bimetallic compensation balance, precision regulator, observatory quality, timed to 6 positions, two-tone silvered matte dial, upper dial for minutes combined with aperture for Arabic hours, subsidiary dial for seconds, rectangular flared case with raised bezel, snap back, case signed and stamped with Glasgow importation marks for 1930, dial and movement signed.