Clock mechanism (110), in particular
clock movement or chronograph module, comprising: - a frame (80, 81), and - a counting chain (100) comprising an epicyclic
train (31, 32, 33, 34) including a first planetary gear (33) fixed to the frame. A method for assembling two separate mechanisms or two separate timepieces, comprising the following steps: - a step of supplying a frame (80, 81), - a step of mounting a
drive wheel (20) onto the frame (80, 81), - a step of mounting an hour counter (40) onto the frame (80, 81), and - a step of assembling: • a wheel (30') meshing with the
drive wheel and with the hour wheel, or • an epicyclic
gear train (31, 32, 33, 34) meshing with the
drive wheel and with the hour wheel. The method makes it possible to obtain two separate mechanisms but with identical frames, identical drive wheels, and an identical hour wheel.