Rolex, a gentleman's octagonal wristwatch, Model: Oyster, circa 1930,

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Rolex, a gentleman's octagonal wristwatch, Model: Oyster, circa 1930,
white enamel dial signed Rolex Oyster, luminous Arabic numerals, subsidiary seconds, luminous hands, 15-jewel movement with patented superbalance, octagonal case with milled bezel, wire lugs, screw down winding crown, associated milled edge screw back, 32mm.
See Colour Illustration (Plate 15)