This is one regular picture we’re going to use for now. When Ayushi takes the rest of the pictures we will update the listings with the additional pictures. 

Patek Philippe 5065/1a Aquanaut Jumbo ’Grenade Tritium’ Rare Vintage Stainless Steel with Black Arabic Tropical T-Dial. This Jumbo cushion-shaped model has a wide, flat, brushed bezel, and a solid three-body case with concave lugs and a sapphire crystal. The dial is black composite with the subtle geometric Tropical design, applied Arabic numerals with Tritium hour markers, and matching baton hands. It has a center sweep second hand, outer luminous dot and minute divisions, and an aperture for the date at 3 o’clock. Fitted on an extremely rare stainless steel Aquanaut bracelet with a double fold-over deployant buckle.

The Patek Philippe Aquanaut  5065/1a  Jumbo ’Grenade Tritium’ is a truly legendary timepiece in the world of high horology, celebrated for both its historical significance and iconic design language. As one of the earliest and most sought-after references from the Aquanaut line, the 5065/1a embodies the transition from Patek Philippe’s classic traditions into the modern era of luxury sports watches, merging rugged functionality with sophisticated aesthetics. With its 38mm “Jumbo” stainless steel case, the watch offers bold wrist presence while remaining elegant and wearable, making it a highly desirable piece for discerning collectors and enthusiasts alike.

The case design is pure brilliance—cushion-shaped with concave lugs, a solid three-body construction, and a wide, flat brushed octagonal bezel that draws inspiration from its cousin, the Nautilus. Vertical brushing contrasts beautifully against polished bevels, demonstrating Patek Philippe’s unmatched case finishing. A sapphire crystal on the front and caseback completes the robust yet refined profile, allowing a full view of the meticulously finished movement within.

What truly sets this reference apart is its rare and coveted “Grenade Tropical T-Dial”—a black textured composite dial adorned with the now-iconic embossed checkerboard motif. This unique pattern gives the watch its nickname and provides subtle depth and character to the dial. Tritium lume-filled Arabic numerals and luminous baton hands offer superb legibility and add to the vintage charm, especially as the tritium ages into a warm patina over time. The center sweep seconds hand and the date aperture at 3 o’clock add functional elegance to this otherwise minimalist, balanced layout. The subtle luminous minute markers along the outer track enhance precision without overwhelming the design.

The 5065A is fitted with an extremely rare stainless steel Aquanaut bracelet, a collector’s grail in itself, crafted with the same precision and finish Patek is known for. Its integrated design and secure double fold-over deployant clasp provide both comfort and durability, making it ideal for everyday wear despite its exclusivity.

Powering this timepiece is the Patek Philippe calibre 315 SC, a self-winding mechanical movement admired for its reliability, beauty, and thinness. The movement, visible through the sapphire crystal exhibition case back, is decorated with Côtes de Genève, and features a straight-line lever escapement, self-compensating flat balance spring, shock absorber system, and the prestigious Patek Philippe Geneva Seal, a mark of exceptional craftsmanship and precision.

Released during a period when luxury sports watches were still a novelty in haute horlogerie, the Aquanaut  5065/1a  represents a bold step forward for Patek Philippe. Designed under the influence of the legendary Gerald Genta, the Aquanaut fused Genta’s daring architectural lines with Patek’s refined watchmaking DNA. The 5065/1a  was only produced for a few years in the late 1990s and early 2000s, making it extremely rare and highly collectible today, especially with original tritium dials and the seldom-seen full steel bracelet.

This Patek Philippe  5065/1a  Jumbo ’Grenade Tritium’ isn’t just a watch—it’s a milestone in the evolution of contemporary horology. A piece that paved the way for future luxury sport references, it continues to captivate collectors with its timeless aesthetic, scarce availability, and historical significance. A true collector’s trophy and a wearable piece of horological history.

Pristine Collector Condition