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501 = sapphire models
580 = acrylic models
A 16750 on 78360 needs 580.
501 will fit but not well.
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- Rolex Explorer - 214270
- Tudor Black Bay - 79230B
- Tudor Chronograph - 79270P
- Breitling Chronomat - 10th Anniv.
- Huguenin Freres Speedmaster Prototype
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