Automatic Patek Philippe Calibre CH 28-520 IRM QA 24H movement with annual calendar and chronograph functions. Features blue varnished dial, luminous white gold hands/index markers including minute indicators on the outer rim. Comes equipped with an 18kt white gold case fixed set bezel, a vintage brown leather strap, scratch resistant sapphire crystal glass, transparent case back revealing the mechanical movement composed of 456 parts and containing 40 jewels. Power reserve: approximately 55 hours due to bitting at 28800 vph. Water resistance: up to 30 meters (100 feet). Round shape measuring 40.5 mm diameter with thickness of 13.53 mm, secured by a tang clasp. Part of the Complications Series labeled Swiss Made and representing luxury watch style.