Powered by tandem mainsprings to provide the 10-day power reserve, both barrels are wound simultaneously, the larger barrel wound directly and transferring power to the smaller. The first barrel is equipped with a system containing a slipping bridle, which prevents both mainsprings from being over-wound and disengages the barrels when they have reached their winding limit. It takes a Patek Philippe watchmaker up to 3 months to produce a Ref. 5101 from beginning to end.
Ref. 5101 was produced in platinum, yellow, white and pink gold. Examples in white gold, such as the present lot, are the rarest to appear at auction. To date only one other example was previously offered, making the present lot the second of its kind to become available in the auction market.
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