The Jaeger Lecoultre 881G watch movement features a rotor placed off-center and an integrated winding gear, resulting in a remarkably slim movement for its time. It employs a detached manual wind mechanism and is equipped with either a screw balance or a ring balance, marking a notable advancement. It should be noted that for Ocean Star models, the split stem can only be detached by turning the crown step by step to the correct angle. Additionally, this movement offers automatic winding and sweep seconds functionality.