Patek Philippe Nautilus 40 mm 3700/11A Steel Blue

The Patek Philippe Nautilus 3700/11A is one of the most historically significant wristwatches ever produced, and this certified authentic used example for sale at Bizak & Co. represents a genuine opportunity to own a piece of horological legend. Introduced in 1976, the Nautilus was conceived by the legendary designer Gérald Genta — the same creative force behind the Audemars Piguet Royal Oak — at the request of Patek Philippe. Its mission was audacious: to create a luxury sports watch in stainless steel that would command the respect and price of gold dress watches. The 3700/11A is the original reference that accomplished exactly that, and it changed the industry forever.

The design language of the Nautilus 3700/11A is instantly recognizable and has lost none of its power after nearly five decades. The 40mm octagonal case is crafted from stainless steel and features the porthole-inspired shape with rounded horizontal lugs that give the Nautilus its unmistakable silhouette. The integrated stainless steel bracelet flows seamlessly from the case and terminates in a refined fold-over clasp, a hallmark of the line's commitment to both comfort and elegance. Every edge, chamfer, and polished surface speaks to Patek Philippe's extraordinary level of finishing.

At the heart of this reference beats a Swiss-certified automatic movement, delivering the reliability and precision expected of a Patek Philippe. The blue dial — arguably the most celebrated colorway in the Nautilus family — presents a distinctive horizontal embossed pattern that catches light with remarkable depth and dimensionality. Index markers provide clean, legible timekeeping, keeping the dial sophisticated and uncluttered. The stainless steel bezel frames the dial with architectural authority.

On the wrist, the Nautilus 3700/11A carries a presence that transcends its 40mm dimensions. The integrated bracelet hugs the wrist with a comfort that few watches can match, while the alternating polished and brushed surfaces of the case and bracelet reward close inspection. Water resistance of 120 meters (396 feet) means this is a watch built to live an active life, equally at home in a boardroom or on a yacht — exactly the spirit Genta and Patek Philippe intended when they first conceived the Nautilus concept.

The 3700 series represents the genesis of an entire horological culture, and demand for original Nautilus references has only intensified over time. Collectors worldwide search for references like the 3700/11A because they understand its foundational importance: this is not merely a watch, it is the watch that proved luxury sport could coexist in one stainless steel package. Finding a certified authentic example in used condition is increasingly rare, making this listing at Bizak & Co. a compelling proposition for the serious collector.

Bizak & Co. is proud to offer this Patek Philippe Nautilus 3700/11A for sale online at bizakandco.com. Every timepiece in our inventory is certified authentic, and our team of specialists is available to answer your questions, provide additional photographs, or assist with acquisition. Whether you are a long-time Patek collector or acquiring your first Nautilus, Bizak & Co. delivers the trusted expertise and white-glove service that this caliber of watch demands. Reach out today to discuss this extraordinary reference before it finds its next home.