**Patek Philippe 5135P** The reference 5135P represents Patek Philippe s Complicated Annual Calendar series in a platinum configuration. This 38.2mm reference was produced from 2006 to 2014, positioning it as a mid-sized complication within the manufacturer s complex watch offerings. The annual calendar function distinguishes this model from simple three-hand references while remaining below perpetual calendar complexity. The 5135P features a 38.2mm platinum case fitted with a fixed bezel and sapphire crystal. The white dial provides contrast against the platinum case material. The automatic Cal. 324 S QA LU movement delivers 48 hours of power reserve, with the watch maintaining 30 meters of water resistance. A leather strap completes the configuration. This reference appeals to collectors seeking Patek Philippe complications in precious metal cases. The platinum construction and annual calendar function target serious collectors prioritizing complex mechanical displays over sport functionality. The eight-year production run from 2006 to 2014 provides reasonable availability within the secondary market for this complicated reference.