The cost of service for an automatic watch is roughly similar to that of a manual mechanical watch. This news, which will surely please you when you want to acquire one, reflects the fact that the automatic mechanism and the "simple" date display are so widespread that do not pose particular difficulties to the professional watchmaker.
Instead, when this is coupled with the power reserve indication, or with other functions such as moon phase or chronograph, the maintenance service requires more technical effort and therefore usually costs more. This is a rule that always applies.
In addition, it must be remembered that the service to a watch costs more if carried out at the official service network of a Maison, while it is cheaper if carried out by an independent professional watchmaker. Obviously, this depends on whether a watch is under warranty or not. Therefore, you should carefully consider the two options in the latter case before choosing the best solution for your timepiece