Patek Philippe chose to unviel its much anticipated Chronograph Ref. 5170J at Baselworld 2010. The new classic men’s chronograph watch was developed and crafted entirely by Patek Philippe in the manufacture’s workshops. Aiming to create one of the most beautiful chronograph calibers ever made, Patek Philippe's Ref. 5170J had to outperform its predecessor, the CH 27-70 PS. The new 29-535 PS caliber movement was first introduced last November with the launch of the Patek Philippe Ladies First Chronograph after over five years of development. The movement is just 5.25 mm, making it the world record holder for the thinnest split-seconds chronograph movement with column-wheel control.

The Patek Philippe Chronograph Ref. 5170 has an 18K yellow gold case that measures 39 mm in diameter and 10.90 mm thick. The silvery opaline dial and case-back are protected by a sapphire-crystal glass. The dial has white off-center subsidiary dials with circular guilloché patterns that display seconds between 8 and 9 o'clock, and a 30-minute counter between 3 and 4 o'clock. Each sub-dial has either a baton-style hand in 18K yellow gold black or a nickel-plated baton style hand in 18K yellow gold. The case is water-resistant up to 30 meters. The watch is completed by a matt brown hand-stitched alligator skin strap with rectangular scales and an 18K yellow gold fold-over clasp.

The Caliber CH 29-535 PS is a manually wound mechanical movement, column-wheel chronograph. Featuring a chronograph hand and an instantaneously jumping 30-minute counter. The movement measures 29.60 mm in diameter by 5.35 mm high. The movement is made up of 269 individual parts and 33 jewels. The movement allows for up to a 65 hours power reserve. It beats a frequency of 28,800 semi-oscillations/hour. The crown has two-positions, when pushed in it will wind the watch - and when pulled out it will set the time and stop seconds. The movement has the Patek Philippe Seal.