As one of the most prestigious watchmaking houses in the world, Patek Philippe is a brand that needs no introduction. Also one of the few whose vintage stainless steel references are commonly known to fetch more than their precious metal counterparts, a vintage 1940’s Patek Philippe reference 1518 chronograph in steel famously sold for $11.1 million in November 2016, setting a world record for the most expensive wristwatch sold at auction.