ReviewComplex Mechanics, Clear Display: The IWC Big Pilot’s Watch Constant Force Tourbillon

While IWC are best known for pilot’s watches, the Big Pilot collection has also become a platform for some of the brand’s more complicated watchmaking. Over the years, the Schaffhausen-based manufacture have introduced perpetual calendars, tourbillons, and specialised manufacture movements within the collection, going well beyond their original offerings. The Big Pilot’s Watch Constant Force Tourbillon follows the same path. Combining a tourbillon with IWC’s patented constant force mechanism, the brand is bringing together two systems intended to improve timekeeping performance. Housed in IWC’s Armor Gold case and paired with a moonphase display and manufacture calibre, it is among the more mechanically complex IWC watches in the current Big Pilot collection. While the mechanics beneath the dial are undoubtedly the main talking point, what makes this watch interesting is how IWC present all this complexity in a really clean and legible format. Packed in a proprietary gold case, the Big Pilot’s Watch Constant Force Tourbillon IW590503 features a black dial, powered by a robust hand-wound movement doing all the heavy lifting inside.

Engineering Precision: The IWC Big Pilot’s Watch Constant Force Tourbillon

The IWC Big Pilot’s Watch Constant Force Tourbillon IW590503 wears a 46.2mm case made from IWC’s proprietary 18-karat Armor Gold. Compared to conventional gold alloys, this material promises greater hardness, making it better suited to a watch of this size. The case is paired with a black dial featuring a louvred, ring-shaped structure that adds depth without making the display feel busy. Fitted with a screwed-in crown, the watch is water-resistant to 60m. Despite the number of complications, the dial remains very easy to read.

The one-minute constant force tourbillon sits at nine o’clock and doubles as a seconds display. This is balanced by the Double Moon display at two o’clock and a power reserve indicator at four. The moonphase tracks the moon as seen from both the Northern and Southern hemispheres and is accurate to within a single day over 577.5 years. Gold-plated hands filled with Super-LumiNova improve legibility in low light, while a convex sapphire crystal with anti-reflective coating sits atop the dial.

The highlight of this watch is its constant force tourbillon mechanism. As the mainspring unwinds, the amount of power it delivers gradually changes. That’s where IWC’s patented constant force mechanism comes in. It is designed to make that power delivery more consistent, while the tourbillon helps counter the effects of gravity on the movement. Together, they help the watch have stable performance throughout its 96-hour power reserve. Completing the watch is a black rubber strap with an Alcantara inlay and the Armor Gold folding clasp.

Powering The Complications

The IWC Big Pilot’s Watch Constant Force Tourbillon IW590503 is powered by the hand-wound IWC manufacture calibre 94800. Visible through the sapphire crystal caseback, the movement has been fully blackened to match the watch’s gold-and-black aesthetic. It beats at 18,000vph and delivers up to 96 hours of power with a twin-barrel construction.

The Big Pilot’s Watch Constant Force Tourbillon is not about a single complication or a design element. What stands out about the Big Pilot’s Watch Constant Force Tourbillon is how it clubs many complications that work nicely together in a single piece, delivering a watch that remains clear, balanced, and unmistakably a Big Pilot.

IWC’s patented constant-force mechanism makes power delivery more consistent, while the tourbillon helps counter the effects of gravity on the movement

The IWC Big Pilot's Watch Constant Force Tourbillon comes with a moonphase display that tracks the moon as seen from both the Northern and Southern hemispheres

The IWC Big Pilot’s Watch Constant Force Tourbillon in a nutshell

• Case: 46.2mm; 18-karat Armor Gold; convex sapphire crystal with anti-reflective coating on both sides; sapphire crystal caseback; screw-down crown; 60m water resistance
• Functions: Hours, minutes, tourbillon with constant force mechanism, Double Moon display, power reserve indicator
• Dial: Black dial with louvred ring-shaped structure; gold-plated hands with Super-LumiNova
• Movement: Hand-wound IWC manufacture calibre 94800; 18,000vph; twin barrels; 96-hour power reserve
• Strap: Black rubber strap with Alcantara inlay; 18-karat Armor Gold folding clasp