A stainless steel boy's size wristwatch, Model: Oyster, Ref:3121, 1930's,

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A stainless steel boy's size wristwatch, Model: Oyster, Ref:3121, 1930's,
silvered dial signed Rolex Oyster, Arabic numerals, subsidiary seconds, luminous hands, case with screw down winding crown, screw back, 28mm.