The JLC 891 is a watch full calendar automatic movement from Jaeger-LeCoultre.
Calibre 891 is an automatic movement running at 28,800 vph. It has 36 jewels and a power reserve of 40 hours. It is a traditional-looking movement with central sweep hands for hour, minute, and date pointer, and a subdial for seconds. It also has windows for day and month at 10:00 and 2:00, respectively.
Jaeger-LeCoultre used this calibre in the Jaeger-LeCoultre Master Calendar.