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The watch link has a safety system, which prevents the crown from being pulled out when the chimes junghans 17 jewels are activated (and which also blocks the chimes from striking if the crown is pulled out). The tourbillon cage is fitted with a stop seconds mechanism, for more precise time-setting rolex oyster perpetual datejust prezzo usato (the one-minute tourbillon's gold pointer functions as a seconds hand).
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