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This is a generic mainspring for Rolex Caliber 4030, designed for the Rolex 4030 automatic chronograph movement (Zenith Daytona series). This is a brand new replacement part, not a Rolex original, measuring 1.24 × 12.5 × 0.146 mm, suitable for movement repair and servicing .
Compatible Movement：Rolex Caliber 4030 (Zenith Daytona)
Part Number：771
Mainspring Size：1.24 × 12.5 × 0.146 mm (height × diameter × thickness)
Type：Automatic mainspring
Origin：Switzerland
Quality：Generic replacement (non-original)
Movement Specs：31 jewels, 28,800 bph, approx. 50-hour power reserve
1. Is this mainspring an original Rolex genuine part?
No. This is a generic replacement, not a Rolex original, but specifically sized for the 4030 movement.
2. Which movements is this mainspring compatible with?
It fits the Rolex 4030 automatic chronograph movement (Zenith Daytona series, produced 1988-2000). This movement was based on a modified Zenith El Primero and was Rolex’s last outsourced chronograph caliber .
3. What tools are needed for mainspring installation?
A mainspring winder and barrel tools are required. The 4030 is a precision movement—pay attention to the sliding attachment seating. Work should be performed by a qualified watchmaker.
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