Omega Genuine caseback 2857-2856-2 SC Vintage oversize 36mm rare case for parts
Inside the case back inner is the wording “Acier Inoxydable, Omega Watch Co, Fab Suisse, Swiss Made, Patent 315164” and the reference for this specific Omega Seamaster variation 2857-2856-2 SC. The SC in this context stands for “second centrale”.
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