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This is a high‑quality generic case back crystal (exhibition back) for the Zenith El Primero Chronomaster reference 03.1260.4021 (42mm case), measuring 27.4mm in diameter and 0.8mm in thickness with a flat round profile. Made of either mineral glass or sapphire glass (confirm with seller), it offers good scratch resistance and optical clarity, serving as a direct substitute for a damaged or scratched original case back crystal.
Generic Replacement – Designed for Zenith El Primero Chronomaster 03.1260.4021 (non‑original but exact fit).
Exhibition Back – Clear glass allows full view of the movement.
Material Options – Mineral glass (budget) or sapphire glass (ultra‑hard) – confirm with seller.
Precise Dimensions – 27.4mm diameter × 0.8mm thickness, flat round profile for perfect fit into the case back gasket groove.
Easy Installation – Direct replacement for damaged or scratched original crystal; no case back modification needed.
| Parameter | Details |
|---|---|
| Compatible Model | Zenith El Primero Chronomaster 03.1260.4021 (42mm case) |
| Type | Generic (aftermarket, not genuine) |
| Diameter | 27.4 mm |
| Thickness | 0.8 mm |
| Profile | Flat round |
| Material | Mineral glass or sapphire glass (confirm with seller) |
| Function | Exhibition back to showcase movement |
1. Is this a genuine Zenith case back crystal?
No. This is a generic aftermarket replacement, not manufactured by Zenith, but its dimensions match the case back opening of reference 03.1260.4021.
2. Should I choose mineral or sapphire glass?
Mineral glass is more affordable but moderately scratch‑resistant. Sapphire glass is extremely hard (9 on Mohs scale) and nearly impossible to scratch in daily use, but costs more. Check availability with the seller before ordering.
3. Will water resistance be affected after installation?
Water resistance depends on the sealing gasket inside the case back, not the glass itself. Always inspect or replace the gasket during installation and ensure the glass is seated evenly. Professional installation and a pressure test are recommended.
4. Will this fit other Zenith El Primero models?
This crystal is specifically sized for 03.1260.4021 (42mm case). Other models (e.g., 38mm cases or different case back designs) may require different dimensions. Measure your original crystal’s diameter and thickness to be sure.
5. How can I verify the correct size?
Remove your original case back crystal and measure its diameter (should be 27.4mm) and thickness (should be 0.8mm) with a caliper. If they match exactly, this replacement will fit.
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