Nautilus 5726 Stainless Steel / Black

In Context

At 40.5 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 11.3 mm thick it is about average for a modern wristwatch. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. 120 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement winds itself from the motion of your wrist. 45 hours of reserve carries it overnight, but not through a weekend in a drawer. At 28,800 vph the seconds hand advances 8 times a second.

5726/1A-001 is one of 3 executions of the 5726/1A base reference. Underneath they are the same watch; what separates this one is a black dial and a stainless steel case.

The 324 S QA LU 24H/303 is Patek Philippe's annual calendar, the movement of the ref 5396 and the Nautilus 5726. It shows the day, date and month in apertures, with a moon phase and a 24-hour indicator. It powers 17 watches in this library. It builds Patek's patented annual calendar, which knows the length of every month except February, onto the [324 S C](/calibers/patek-philippe-324-s-c) base: 347 parts, 34 jewels, a Gyromax balance beating at 28,800 vph for a 45-hour reserve, at 33.3 mm across, carrying the Patek Philippe Seal. The day and month sit in windows under 12 o'clock, the date at 6 with the moon, and the 24-hour dial beside it. The glossary defines the [annual calendar](/glossary/annual-calendar). In the library it powers 13 [Complications](/brands/patek-philippe/complications) references, the 5396 in rose and white gold at 38.5 mm and 38 mm, and 4 [Nautilus](/brands/patek-philippe/nautilus) 5726 references at 40.5 mm. 2 are limited editions. The [324 S QA LU](/calibers/patek-philippe-324-s-qa-lu) and [324 S IRM QA LU](/calibers/patek-philippe-324-s-irm-qa-lu) are the other annual calendars on the same base, and the [240 Q](/calibers/patek-philippe-240-q) the perpetual calendar on the ultra-thin 240.

16 other watches in the library run the Patek Philippe 324 S QA LU 24H/303.

Patek Philippe

Nautilus 5726 Stainless Steel / Black

5726A-001 · 40.5 mm

Patek Philippe

Annual Calendar 5396 Rose Gold / Silver

5396R-011 · 38.5 mm

Patek Philippe

Nautilus 5726 Stainless Steel / Blue

5726/1A-014 · 40.5 mm

Patek Philippe

/1G-001 Annual Calendar 5396 White Gold Blue Bracelet

5396 · 38 mm