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This is a generic replacement sapphire crystal for the Breguet Marine reference 5817 (40mm case), measuring 31.5mm (diameter) × 2.6mm (overall height) × 1.6mm (edge thickness) with a domed round profile. Made of synthetic sapphire glass (Mohs 9), it offers exceptional scratch resistance and excellent optical clarity, often with anti‑reflective (AR) coating, serving as a direct substitute for a damaged or scratched original crystal. As an aftermarket part, it provides watchmakers and enthusiasts with a cost‑effective solution to restore the iconic nautical‑vintage appearance of the Marine 5817.
Sapphire Material – Mohs 9, highly scratch-resistant and optically clear.
Domed Round Profile – Raised center with thinner edges, providing a vintage domed appearance matching the original.
Anti-Reflective Coating – Reduces glare, enhances dial legibility, especially in bright marine environments.
Precise Dimensions – 31.5mm diameter, 2.6mm overall height, 1.6mm edge thickness, designed for the Marine 5817 case.
Aftermarket Advantage – Significantly lower cost than genuine parts, reducing repair downtime. Suitable for first-generation Marine 5817 (steel or gold).
| Parameter | Details |
|---|---|
| Compatible Model | Breguet Marine 5817 (40mm case, steel or gold) |
| Material | Synthetic sapphire (Mohs 9) |
| Shape | Domed round |
| Diameter | 31.5 mm |
| Overall Height | 2.6 mm |
| Edge Thickness | 1.6 mm |
| Coating | Anti-reflective (AR) |
| Type | Generic aftermarket |
1. Is this a genuine Breguet crystal?
No. It is a generic aftermarket replacement, not original, but dimensionally identical to the Marine 5817 crystal.
2. How can I be sure this crystal fits my 5817?
Measure your original crystal’s diameter (31.5mm), overall height (2.6mm), and edge thickness (1.6mm). If they match, it will fit. Both steel and gold versions use the same crystal.
3. Will the anti-reflective coating peel off?
It will not peel under normal use. Avoid abrasion with hard objects or harsh cleaning. Fine scratches may appear over time – this is normal.
4. What should I pay attention to during installation?
Use a new sealing gasket, apply UV adhesive or crystal glue to the edge, and press evenly with a crystal press. Professional installation is recommended.
5. Will the original water resistance be maintained?
The Marine 5817 is typically 100m water resistant. Proper installation with a new gasket can restore similar water resistance. A water resistance test is advised after installation.
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