JLC 881
The JLC 881 is an automatic chronometer movement from Jaeger-LeCoultre.
Introduced in 1961, the Calibre 881 was much more advanced than earlier Jaeger-LeCoultre automatic movements. No longer a bumper movement, Cal 881 features a full 360ยบ winding system and, unlike many similar movements of the era, can wind in both directions. It beat at 19,800 vph, has a sweep second hand, and a date window.
The Calibre 881 was used in the famous Jaeger-LeCoultre Geomatic (ref E 398) and was submitted to COSC for chronometer certification. Jaeger-LeCoultre had earlier achieved chronometer certification with a descendent of their first automatic, P 476/3.
Cal. 880 Family
Calibre 881 was part of a family of movements, including Calibres 880, 882, and 883. There are three main variants of this family:
- The basic movements have a fixed stud carrier
- Later Chronometer versions have a movable stud carrier
- Some also came with a "Spirotor" regulator with no stud for the balance spring
- Fixed stud carrier
- K880: 17 jewels, optional date
- K880G: 23 jewels, chronometer for Geomatic
- K880S: 23 jewels, hacking, optional date
- Movable stud carrier
- K880G: 23 jewels, optional date, chronometer for Geomatic
- K881S: 23 jewels, date, hacking
- Spirotor regulator
- K882: 17 jewels
- K883: 17 jewels, date
- K883G: 23 jewels, date, chronometer for Geomatic
- K885: 17 jewels, manual wind