This new classic column-wheel chronograph movement comes in a yellow gold case with rectangular pushers reminiscent of Patek Philippe's famous 1940s and 1950s wrist chronographs. The Ref. 5170 is a mechanical chronograph in the best tradition. It embodies the new CH 29-535 movement, a caliber developed and crafted according to the criteria of the Patek Philippe Seal . GENERAL * Chronograph * Caliber CH 29-535 PS * Mechanical manually wound movement * Central chronograph hand and 30-minute elapsed time counter * Seconds subdial * Silvery opaline dial, gold applied hour markers * Strap: alligator with rectangular scales, hand-stitched, matt chocolate brown * Fold-over clasp * Sapphire-crystal case back * Water resistant to 30 m * Case diameter: 39 mm CALIBER CH 29-535 PS * Column-wheel chronograph, chronograph hand, subsidiary seconds, and 30-minute counter * Diameter: 29.60 mm * Height: 5.35 mm * 33