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This is a generic sapphire crystal for the Zenith El Primero Chronomaster 02.0310.400, measuring 29.85mm × 1.1mm with a pan shape and blue anti-reflective coating. It serves as a replacement crystal for servicing the Zenith El Primero 02.0310.400 chronograph, restoring its appearance and readability. This product is a generic replacement, not an original Zenith part.
Product Name：Generic Zenith El Primero Chronomaster Sapphire Crystal
Compatible Model：Zenith El Primero 02.0310.400 (with El Primero 400 movement)
Dimensions：29.85 × 1.1 mm (diameter × thickness)
Shape：Pan shape
Coating：Blue reflective (anti-reflective)
Material：Sapphire crystal
Type：Generic replacement, non-original
Before purchase, verify: your watch is the Zenith El Primero 02.0310.400 (40mm case); measure your old crystal to confirm 29.85×1.1mm (tolerance within 0.1mm); confirm the pan shape; this is a generic replacement, not an original Zenith part—contact an authorized Zenith service center for original parts.
1. Is this crystal an original Zenith genuine part?
No. It is a generic replacement, not an original Zenith part, but specifically sized for the 02.0310.400 model.
2. Which watch models is this crystal compatible with?
It fits the Zenith El Primero 02.0310.400 chronograph, which features the El Primero 400 movement, 40mm case diameter, and approximately 13mm thickness .
3. Is the sapphire crystal scratch-resistant?
Yes. Sapphire crystal has very high hardness (Mohs 9), offering excellent scratch resistance, second only to diamond.
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