Vintage
IWC Ocean 2000 BUND Transitional Case Back 3501/3509
IWC · May 20, 2026
An IWC Ocean 2000/BUND collector inherited a case back with a unique configuration: outer number for 3509 model, inner stamping for 3501. Research suggests IWC reused 3501 case backs for 3509 producti
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