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The hands look replaced and buckle looks aftermarket. Bracelet could be original.
Without opening it, no way to know if the guts are genuine.
For what it’s worth, a modern show and sell AD won’t necessarily even know. Their staff aren’t always vintage aware. But if they have a tech on site, maybe.
Best bet is open it up and take many good pics then post here.
Also better pics of the clasp from all angles.
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