Originally launched in the anti-magnetic Milgauss, also found in Air-King 40 (2016). As of August 2022, Milgauss models still use caliber 3131. Air-King upgraded to Cal. 3230.
Last updated 29 Apr 2026Suggest a correction
TECHNICAL SPECIFICATIONS
Movement Type
Automatic
Jewel Count
48 jewels
Power Reserve
48h
Frequency
28,800 vph (4 Hz)
Display Type
Analog
Rotor Type
Central Rotor
Winding
Automatic (Bidirectional)
Shock Protection
KIF
FEATURES
Hand Winding
QUICK FACTS
BRAND
TYPE
AutomaticSTATUS
DiscontinuedMANUFACTURE
In-houseLAUNCH YEAR
2007BASED ON
Rolex 3130CALIBER FAMILY
31xxCOUNTRY
SwitzerlandALSO KNOWN AS
cal. 3131
FOR WATCH DEALERS
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