Winding device for automatic watch

A winding device for an automatic watch with a mobile oscillating mass, including at least one watch holder arranged to carry at least one automatic watch, and including motorisation means for driving said at least one watch holder, wherein said device includes measuring means which are arranged to measure the variation in the resistive torque which is opposed to said motorisation means by a mobile equipment consisting of, on the one hand, all said watch holders driven by said motorisation means, and on the other hand all the watches that all said watch holders driven by said motorisation means carry, depending on the degree of winding of said watches, and wherein said measuring means include speed measuring means to determine the speed and/or the variation in the speed of said motorisation means, and/or include torque measuring means to determine the value of the torque and/or the variation in the torque at least at one said watch holder, and/or include current measuring means to determine the value of the current and/or the variation in the current at least at one electric motor that said motorisation means include.