In 2010 Patek Philippe released the 5170 line of manually wound two-register chronographs to replace the beloved 5070 line. The 5170J-001 has a round yellow gold case that is 39mm in diameter with a scratch-resistant sapphire crystal, an exhibition case back and a screw-down crown. The dial design harkens to the classic Patek design of the 1940s with an opaline white dial, two sub-dials, a tachymeter in the outer rim, yellow gold hands and roman mix numeral hour markers. The 5170J-001 is powered by the CH 29-535 PS caliber which is manually wound with chronograph functionality and a power reserve of up to 65 hours. The case is paired with a brown leather strap with a yellow gold fold-over closure. It has a water resistance of 30 meters (100 feet).