Patek Philippe Aquanaut Reference 5167 The Reference 5167 represents the 40mm stainless steel iteration within Patek Philippe's Aquanaut model line. Introduced in 2007 and remaining in current production, this reference features a black dial and establishes the standard sizing for the steel Aquanaut offering. The 40mm stainless steel case houses the automatic Caliber 324 S C movement, providing 45 hours of power reserve. The watch incorporates a sapphire crystal and smooth bezel configuration. Water resistance extends to 120 meters, while the distinctive composite rubber strap displays an embossed check pattern that complements the case design. This reference appeals to collectors seeking contemporary Patek Philippe sports watch execution in stainless steel. The 5167 offers entry into the Aquanaut model range while maintaining the manufacturing standards associated with the Geneva manufacture. Its ongoing production status ensures availability through authorized channels for both new collectors and those expanding existing collections.