Rolex. An unusual stainless steel automatic bubble back wristwatch with sweep centre seconds, 24 hour indication and bracelet

Rolex. An unusual stainless steel automatic bubble back wristwatch with sweep centre seconds, 24 hour indication and bracelet
Signed Rolex, Oyster Perpetual, Chronomètre, ref. 3135, case no. 115'487, manufactured in 1938
Cal. 9 3/4''' nickel-finished lever movement, 17 jewels, rotor engraved Rolex Auto Rotor, Chronometer, Swiss Made, Patented, Super Balance, silvered matte dial, luminous Arabic numerals, luminous hands, inner red 24 hour display, sweep centre seconds, tonneau-shaped water-resistant bubble back type case, screw back, screw down crown, stainless steel expandable bracelet, stainless steel deployant clasp signed Rolex, case, dial and movement signed
33 mm. diam.