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This is a generic replacement sapphire crystal for the Jaquet-Droz Grande Seconde Off-Centered reference J006033271, measuring 39.1mm × 38.9mm (length × width) with a thickness of 3.9mm and a pan‑shape profile. It comes with a matching pan‑shape gasket and features blue anti‑reflective coating to reduce glare and improve readability, serving as a direct substitute for a damaged or scratched original crystal.
Sapphire Crystal – Extremely hard (Mohs 9), scratch‑resistant, and optically clear.
Pan‑Shape Profile – Precisely matches the unique curved contour of the J006033271 case (non‑circular).
Blue Anti‑Reflective Coating – Reduces glare and improves dial visibility, with a subtle blue hue.
Includes Dedicated Gasket – Comes with a matching pan‑shape gasket for proper sealing; no need to purchase separately.
Generic Aftermarket – Non‑original but dimensionally accurate; cost‑effective repair solution.
| Parameter | Details |
|---|---|
| Compatible Model | Jaquet-Droz Grande Seconde Off-Centered J006033271 |
| Type | Generic (aftermarket, not genuine) |
| Material | Sapphire crystal |
| Shape | Pan shape (non‑circular) |
| Dimensions (L×W) | 39.1 mm × 38.9 mm |
| Thickness | 3.9 mm |
| Coating | Blue anti‑reflective (AR) coating |
| Included | Pan‑shape gasket |
1. Is this a genuine Jaquet‑Droz crystal?
No. This is a generic aftermarket replacement, not manufactured by Jaquet‑Droz, but dimensionally and shape‑wise it matches the J006033271 case and includes the gasket for direct installation.
2. How does the sapphire quality compare to the original?
As a high‑quality generic sapphire crystal, its hardness and transparency are close to original standards. The blue AR coating is well applied and durable for daily use, though subtle differences may exist compared to the genuine part.
3. What is the included gasket made of? Do I need additional glue?
The gasket is typically a polymer (e.g., nylon or silicone) for sealing and cushioning. A small amount of dedicated crystal adhesive or UV glue is still recommended between the gasket and case for water resistance. Consult a watchmaker.
4. Why are the dimensions 39.1×38.9mm (non‑circular)?
The case opening of the Jaquet-Droz Grande Seconde Off-Centered J006033271 is a non‑circular shape (slightly oval or tonneau). The crystal is shaped accordingly. Always measure your original crystal before ordering.
5. Will the blue AR coating fade or scratch?
The AR coating on sapphire is softer than the crystal itself. Fine scratches may appear over time with hard contact or abrasive materials. Normal wear and avoiding direct contact with sand or sharp objects will preserve its condition.
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