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Hands-On With The Patek Philippe Ref. 5550P Advanced Research Perpetual Calendar – Patek’s First Watch With The Full Silicon Treatment
Unveiled at Baselworld 2011, the Ref. 5550P Advanced Research is the fourth and final installment of the series of watches from Patek Philippe with silicon components. This is the first Patek equipped with all its parts - escape wheel, pallet fork, balance wheel and hairspring - in silicon.
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