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Patek Philippe

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much thanks.  The A Lange function is advance a day by the push of a button at the 10 o'clock position, all synchronised.  For Patek, to advance a day, you can advance the hour and minute hand 24 hours, achieve the same thing but with much more effort.  Some forum memebers are saying there is a button at the 58th minute on the 3970/5970 to do exactly like the Lange does.  Don't know who is right. 

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