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Patek Philippe

Micro rotor is unidirectional

 

Respectfully, can't speak for every Patek movement but the 240 micro rotor most certainly winds unidirectionally. 

Source: Official  Patek website.

Not necessarily helpful to the OP as the model in question does not use the micro rotor system but I do believe that unidirectional winding is an attempt to reduce thickness of the movement.  

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