That means the 42mm case has 120 meters of water resistance
link and the brown dial has a sunburst effect that ends in a black rim towards the dial's edge. Through the sapphire caseback you can see Patek's self-winding flyback chronograph CH 28-520 C. It powers the central chronograph hand and the Aquanaut's signature 60-minute counter at 6 o'clock.
link It's a column wheel movement with a vertical
link disk clutch. MSRP is CHF 64000.