This is a Mido Ocean Star DatoDay Chronometer, Mido Caliber 1147 OCD (As 1831?), Stainless Steel case, Day/Date at 3. Signed front: ”Mido, Ocean Star, Datoday, Chronometer, Swiss Made”, back: ”6435903, Stainless Steel, Swiss Made, 5519”, inside: ”Mido, Swiss Limited, Cal. 1147 OCD, 19800, Adjusted to six (6) Positions + Temperature, Seventeen 17 Jewels”, Milanaise band with Mido clasp.
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