Frederique Constant Caliber FC-391

Brand	Frederique Constant
Caliber Number	FC-391, FC391
In-House?	No
Base Caliber	Manufacture la Joux-Perret LJP L110
Movement Type	Automatic, self-winding mechanical, chronograph
Diameter	30.4mm
Height	7.9mm
Jewel Count	26 jewels
Beat Rate / Frequency	28,800 bph / 4 Hz
Lift Angle	Unconfirmed
Power Reserve	60 hours
Hand-Windable?	Yes
Anti-Shock Device	Incabloc
Hand Count	6
Functions	Central hours; central minutes; central chronograph seconds; small running seconds subdial at 3:00; 60 minutes chronograph counter at 9:00; 12 hours chronograph counter at 6:00; date at 4:30
Hacking Seconds?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	Frederique Constant Highlife Chronograph (Refs: FC-391WN4NH6, FC-391SB4NH6B, FC-391NS4NH4, FC-391SGR4NH6) (Add your watch to the comments below…)

The Frederique Constant caliber FC-391 is an automatic tri-compax chronograph movement with 26 jewels and 60 hours of power reserve on a full wind.

This movement is basically an LJP (Manufacture la Joux-Perret) calibre L110 with a Frederique Constant branded rotor.

In Frederique Constant’s own words:

“The Highlife Chronograph Automatic is equipped with the FC-391 automatic chronograph caliber, featuring the hours, minutes, seconds, date and a chronograph. Beating at 28’800 alt/h and offering a 60-hour power reserve, the FC-391 automatic chronograph caliber is water-resistant up to 10 ATM.” –Source

Examples of watches with this movement:

The cal. FC-391 is found in the Highlife Chronograph series.

Additional Resources:

• Frederique Constant user manual (pdf)
• More Frederique Constant mentions