The present Patek Philippe Nautilus “Jumbo” reference 3700/1AJ, executed in stainless steel and yellow gold, is a superb example of Gérald Genta’s iconic design in one of its most distinctive and sought-after configurations. Produced in 1981 and sold in 1982, this watch represents an early and highly desirable iteration of the Nautilus. The case remains in excellent overall condition, having been polished in the past and now showing only light wear consistent with careful use, while preserving the elegant proportions and strong lines that define the reference. The watch is fitted with a beautiful blue dial with Luminova markers and matching hands, offering a fresh and vibrant aesthetic while maintaining the classic Nautilus character. The original two-tone “fat links” bracelet is preserved in excellent condition, showing extremely light stretch for its age, and is paired with its original clasp, ensuring both comfort and full period correctness. Importantly, the watch has been fully serviced by Patek Philippe in Geneva in 2025, with accompanying service papers. This recent manufacture service provides complete reassurance regarding both the mechanical performance and the authenticity of the watch. It is further accompanied by an Extract from the Archives confirming its production and sale dates, its original presentation box, and detailed photographs of the case and movement numbers. Combining a desirable two-tone configuration, excellent condition, recent Patek Philippe service, and strong documentation, this Nautilus 3700 represents a compelling opportunity to acquire a highly collectible and historically significant example of one of the most important luxury sports watches ever created.