Patek Philippe Reference 5085 The Reference 5085 represents Patek Philippe's approach to automatic complications during its production period from 1997 to 2008. This reference combines automatic timekeeping with moon phase and date displays in a 36mm case format. The watch positions itself within Patek Philippe's complicated timepiece offerings through its dual calendar functions. The 36mm case is crafted from 18k white gold with a smooth bezel and sapphire crystal. The silvered dial accommodates the moon phase and date complications. The watch operates on the automatic Caliber 315 S IRM QU movement, providing 48 hours of power reserve. Water resistance extends to 30 meters, and the watch is fitted with a leather strap. This reference appeals to collectors seeking Patek Philippe complications in a moderate case size. The combination of moon phase and date functions in white gold construction targets those interested in astronomical complications without perpetual calendar complexity. The eleven-year production run from 1997 to 2008 established this reference within Patek Philippe's contemporary complicated watch portfolio.