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Pre-Owned Patek Philippe Calatrava (3919J001) manual-wind watch, features a 33.5mm 18k yellow gold case surrounding a white dial the original PP black alligator strap with an 18k yellow gold tang buckle.   Functions include hours, minutes and small seconds.  A mechanical watch movement consists of four main parts.  When the winding crown is turned, energy is stored in the mainspring barrel asssembly to keep the watch running.  Your watch has been tested and adjusted for 600 hours in 5 positions. It's water resistant and fitted 

with sealing rings that protect the movement against dust and humidity.   It is recommended that you wind your watch at the same time every day.  Use it and enjoy!