A pink gold automatic wristwatch with black dial, Rolex, Genève, Oyster Perpetual, 'Bubble back', ref.3131, circa 1946

18k, nickel lever automatic movement, 18 jewels, Rolex Superbalance, timed to 6 positions, black dial, applied baton numerals, subsidiary seconds, tonneau form water resistant type three piece case with screw down back and crown, case, dial and movement signed