Patek Philippe Nautilus Jumbo Steel Blue Dial 40mm Ref. 3700/1A stands out as the inaugural Nautilus designed by Gerald Genta, debuting in 1976 and remaining an icon in luxury stainless steel sport watches. Housed in a 40mm stainless steel case, this model features a blue dial with horizontal embossed detailing and is protected by a sapphire crystal. The signature integrated stainless steel bracelet provides a seamless look and comfortable wear, secured by a folding clasp. At its core, the selfwinding Caliber 28-255C powers hours, minutes, and a practical date display, offering a 38-hour power reserve. The reference is water resistant to 100 meters, further emphasizing its versatility as a sports watch. The 3700/1A marries distinctive design with robust everyday performance, making it highly sought after among enthusiasts and collectors for its heritage and pioneering approach to high-end steel watchmaking.