The invention concerns a mechanical watch movement comprising a cage provided with bearings and driving mobiles for the third wheel, central second hand and escapement which pivot in said bearings along axes perpendicular to the cage plane. The cage further comprises: a first pair of bearings defining a first off-centre complementary pivoting axis (E) located such that the staff of the third wheel mobile (A) is equidistant therefrom and from the staff of the central second mobile (C), and a second pair of bearings defining an off-centre complementary pivoting axis (F) located such that the staff of the escapement mobile (D) is equidistant therefrom and from the staff of the central second mobile (C).