Might not be true, but i always thought manual winding movements are somewhat more robust. Winding a watch every day for 10 years (before service) = 365*10*30* (*rounds to wind the watch)= 110.000 rounds of the stem. Thats a lot of wear on the movement..
The automatic movements however are designed to be winded by the rotor (which has ball bearings) and the manual winding feature is a nice bonus to the automatic watch, but the watch cant handle the same wear as a manually wound watch.
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