The El Primero 3604 is a 1/10th of a second automatic chronograph movement, a modified version of the El Primero 3600 that debuted in the Chronomaster Sport. Its open base plate and bridges show the 5 Hz escapement with a lubricant-free silicon escape wheel and pallet lever, and it gives a 60-hour power reserve. Zenith fits it to the Chronomaster Open.
TECHNICAL SPECIFICATIONS
Movement Type
Automatic
Jewel Count
35 jewels
Power Reserve
60h
Frequency
36,000 vph (5 Hz)
Diameter
30mm
Display Type
Analog
COMPLICATIONS
QUICK FACTS
BRAND
TYPE
AutomaticSTATUS
In ProductionMANUFACTURE
In-houseLAUNCH YEAR
2021CALIBER FAMILY
El PrimeroALSO KNOWN AS
FOR WATCH DEALERS
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Watches with this movement
Zenith
Chronomaster Open
03.3300.3604/21.M3300
Zenith
Chronomaster Open
03.3300.3604/51.M3300
Zenith
Chronomaster Open
03.3300.3604/69.M3300
Zenith
Chronomaster Open
03.3301.3604/51.M3330
Zenith
Chronomaster Open
18.3300.3604/69.C922
Zenith
Chronomaster Open
18.3301.3604/72.C870