This is an Eterna Sonic with a special stainless steel case with split stem, date at 3. The movement is an Eterna 1550 (ETA 9162 ), signed front: ”ETERNA, Sonic, Electronic”, back: ”Water Resistant, Stainless Steel, 5533694”, inside: ”ETERNA,Sonic, 1550, Unadjusted, 12 Jewels”.
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