They are made for the a 557 B Rolex 14000 Oyster watch band # 78350 for the 19mm band which has smaller opening to fit Oyster watch band. 17MM 18MM 19MM 20MM 21MM 22MM 23MM 24MM 26MM. Q: How do I check what case number and/or serial number I have on my Rolex or Tudor?.
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