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This is a generic replacement sapphire crystal for the Ulysse Nardin Marine Chronometer model 263-66 (41mm case), measuring 36.5mm in diameter × 2.0mm in thickness, with a flat round profile, anti-reflective (AR) coating, and an integrated date window on the inner side at the 6 o‘clock position. Made of synthetic sapphire glass, it offers exceptional scratch resistance (Mohs 9) and excellent optical clarity, serving as a direct substitute for a damaged or scratched original crystal. As an aftermarket part, it provides a cost-effective repair solution for watchmakers and enthusiasts.
Sapphire Crystal – Mohs 9, highly scratch-resistant and optically clear.
Integrated Date Window – Inner side at 6 o’clock, matching the original dial’s date display.
Anti-Reflective Coating – Reduces glare and improves dial readability.
Precise Dimensions – 36.5mm diameter, 2.0mm thickness, flat round, exact fit for the 41mm case.
Generic Aftermarket – Non-original but manufactured to OEM specs for direct replacement.
| Parameter | Details |
|---|---|
| Compatible Model | Ulysse Nardin Marine Chronometer 263-66 (41mm case) |
| Type | Generic aftermarket |
| Material | Synthetic sapphire |
| Shape | Flat round |
| Diameter | 36.5 mm |
| Thickness | 2.0 mm |
| Coating | Anti-reflective (AR) |
| Special Feature | Integrated date window on inner side at 6 o’clock |
Ulysse Nardin Marine Chronometer 263-66 (41mm, e.g., 263-66-3/43, 263-66-7/43)
Other Ulysse Nardin Marine models using the same 36.5mm flat round crystal with date window (verify original size)
Replacement of damaged, deeply scratched, or aged original crystals
Crystal repair or restoration projects
1. Is this a genuine Ulysse Nardin crystal?
No. It is a generic aftermarket replacement, not original, but matches the 263-66 crystal dimensions and date window position.
2. Does the date window have a magnifying Cyclops effect?
The date window is an inner-side opening that aligns with the dial date, typically without magnification. Confirm with the seller if magnification is required.
3. What should I pay attention to during installation?
Ensure the inner date window aligns with the 6 o’clock dial date. Use a new gasket and UV adhesive, press evenly. Professional installation is recommended.
4. Will the original water resistance be maintained?
Ulysse Nardin Marine Chronometer models are typically 100m or 200m water resistant. Proper installation with a new gasket can restore similar resistance. A water resistance test is advised.
5. Does this crystal fit other Ulysse Nardin models like 263-90?
Different models may have different crystal sizes and date window positions. Measure your original crystal (36.5mm diameter, 2.0mm thickness) and check for a 6 o’clock date window before ordering.
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