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This is a high‑quality generic replacement sapphire crystal for the Girard Perregaux Vintage 1945 references 25820 and 25815, measuring 26.9mm × 26.9mm (square) with an overall height of 3.78mm and a domed profile. Made of synthetic sapphire glass (Mohs hardness 9), it offers exceptional scratch resistance and excellent optical clarity, serving as a direct substitute for a damaged or scratched original crystal.
Material: Synthetic sapphire (Mohs 9), highly scratch-resistant, resistant to daily wear.
Precision dimensions: 26.9mm × 26.9mm square, overall height 3.78mm – designed for the square case of Girard Perregaux Vintage 1945 25820/25815.
Profile: Domed – raised center, providing a classic curved appearance that matches the original crystal.
Optical performance: Often includes anti‑reflective coating (confirm with seller), reducing glare and improving dial readability.
Q1: How to tell if the crystal has an anti-reflective coating?
A: Tilt the crystal under a light. A blue or purple reflection indicates AR coating; white or pale yellow means no coating. This product typically has AR coating – confirm with seller.
Q2: Will the watch retain its original 30m water resistance after replacement?
A: Due to tolerances in generic parts, the original 30m rating cannot be guaranteed. Always perform a water resistance test after installation. Treat as splash‑proof only.
Q3: Is a gasket included with this crystal?
A: No. Purchase a matching square gasket (approx. 26.9×26.9mm, 0.6‑0.8mm cross‑section) separately, and apply a thin layer of silicone grease before installation.
Q4: Does the 3.78mm overall height include the dome?
A: Yes. 3.78mm is the vertical distance from the highest point of the dome to the flat bottom surface. The edge thickness is less than this value.
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