Zenith Caliber 4000SC

Manufacturer	Zenith
Caliber Number	4000SC
Base Caliber	Zenith El Primero 400
Vibrations Per Hour	36,000 bph
Diameter	13”’ (30mm)
Height	6.5mm
Components	278
Power Reserve	50+ hours
Jewels	31
Functions	Hours, minutes, small seconds, date, chronograph, 30 mins, 12 hrs
Country of Manufacture	Switzerland
Known Models	Defy Classic

The Zenith El Primero caliber 4000 SC is based off the caliber 400 but has some modern upgrades including the use of Zenithium. It features a ball bearing rotor made from full tungsten with guilloche pattern. The automatic winding is in both directions.

Zenithium

Zenithium is an exclusive alloy made from aluminum, titanium, and niobium. The aluminum gives characteristics of lightness; titanium gives strength; niobium is for form memory. Zenith created this special shock absorbing alloy to strengthen the the chronograph bridge and balance.

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