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This is a generic sapphire crystal designed for select Audemars Piguet Millenary watches, measuring 33.8 × 29.8 mm with a thickness of 0.8 mm. The Millenary collection is renowned for its distinctive oval case and off‑center dial, requiring a crystal that precisely matches its irregular contour.
Made of synthetic sapphire (9 Mohs hardness), it offers excellent scratch resistance and optical clarity, making it an ideal replacement for damaged or deeply scratched original crystals.
Daily Use：The crystal is fixed; no daily operation needed.
Cleaning：Wipe gently with a soft cloth and mild soapy water; avoid abrasives or strong solvents.
Precautions：Hard but brittle; avoid strong impacts.
Regular Inspection：Check annually for cracks and aged gaskets.
Remove the movement and old crystal.
Thoroughly clean the mounting and gasket grooves.
Inspect and replace the sealing gasket (purchased separately); apply a tiny amount of silicone grease.
Place the new crystal into the groove, ensuring the oval shape aligns with the case contour.
Press evenly into place using a crystal press and nylon dies (hand pressing is strictly prohibited).
Verify the crystal is flush and free of gaps.
Perform a professional water resistance test (original rating typically 3 ATM / 20 m, depending on model).
Important Note：The Millenary crystal has an irregular shape; incorrect orientation will prevent installation or compromise the seal. A crystal press is mandatory. Professional installation by a watchmaker is strongly recommended.
Size Confirmation：This is an oval specialty crystal (33.8 × 29.8 × 0.8 mm). Verify original dimensions before purchase.
Orientation：Pay attention to alignment – incorrect orientation prevents sealing.
Gasket Not Included：The sealing gasket must be purchased separately and replaced every time.
Crystal Press Mandatory：Sapphire is hard and brittle; hand pressing will crack it.
Professional Advice：Due to the unique Millenary case design, service by an authorized center or experienced watchmaker is strongly recommended.
| Aspect | Guidance |
|---|---|
| Daily Cleaning | Wipe with soft cloth and mild soapy water; avoid ultrasonic cleaners. |
| Scratch Repair | Sapphire cannot be polished; deep scratches require replacement. |
| Gasket Replacement | Replace gasket every time the case back is opened; preventive replacement every 3‑5 years. |
| Water Test | Perform a 3 ATM pressure test after installation and annually. |
| Storage | Store unmounted crystals in anti‑static bags away from moisture, heat, and direct sunlight. |
Q1: Which specific Audemars Piguet Millenary models does this crystal fit?
A:This crystal measures 33.8 × 29.8 mm and fits Millenary models that use this oval size (e.g., certain references 4101, 4104). As the Millenary collection includes various sizes, always measure your original crystal before ordering.
Q2: Is a sealing gasket included with the crystal?
A:No. The sealing gasket is not included and must be purchased separately. Use an oval gasket that matches the crystal dimensions (approx. 33.8 × 29.8 mm, cross‑section 0.5‑1.0 mm).
Q3: Can I install this crystal myself?
A:Not recommended. The Millenary crystal has an irregular shape and requires a crystal press, nylon dies, and calibrated tools. Hand pressing will likely crack the crystal or break the seal. Professional installation is strongly advised.
Q4: What should I do if the crystal won‘t press in evenly?
A:Stop immediately. Check gasket alignment, groove debris, and oval orientation. Never force the crystal. Consult a professional watchmaker if the problem persists.
