The power reserve of a timepiece is a key parameter in evaluating the performance of a mechanical movement. A longer power reserve indicates efficient energy transmission and high-quality construction of the barrel and gear train.

In celebration of International Men’s Day on November 19, 2025, let’s highlight exceptional men’s watches from three leading maisons—Patek Philippe, Audemars Piguet, and Richard Mille—that demonstrate some of the most efficient energy systems in modern watchmaking.

1. Patek Philippe Calatrava Ref. 5328G-001

Patek Philippe presents Calatrava Ref. 5328G-001 powered by the Caliber 31-505 8J PS IRM CI J, a hand-wound movement with a power reserve of up to 192 hours, or approximately eight days. Operating at 4 Hz (28,800 vph), this caliber utilizes twin barrels arranged in series to maintain constant torque throughout the full energy cycle. Precision components such as the stop-seconds mechanism enable accurate time-setting, while the power reserve indicator is positioned at 12 o’clock.

Encased in white gold with a 40 mm diameter, this Calatrava represents the balance between efficiency and mechanical precision. With an energy duration exceeding most of Patek Philippe’s other complicated models, the Ref. 5328G-001 stands as a benchmark for long-power-reserve calibers within the classic line.

2. Audemars Piguet Royal Oak Selfwinding 41 mm

Audemars Piguet houses Royal Oak Selfwinding 41 mm an automatic movement operating at 4 Hz with a 70-hour power reserve. Comprising around 257 components, it features a 22-carat gold skeleton rotor optimized for efficient winding.

The redesigned gear train and improved barrel architecture enhance torque transmission efficiency compared to the previous Caliber 3120, maintaining stable amplitude even after three days without wear. Encased in 41 mm stainless steel with the Royal Oak’s signature brushed and polished finish, this model exemplifies the seamless integration of sport-elegant design and technical performance.

3. Richard Mille RM 47 Tourbillon “Time of the Samurai”

Richard Mille RM 47 Tourbillon features a manual-winding movement with a 72-hour power reserve and a 3 Hz frequency. Built from 194 components, the caliber is supported by a titanium baseplate and gold bridges, forming a three-dimensional architectural frame. Its dual-barrel system maintains constant torque without compromising the watch’s compact proportions.

Beyond its striking samurai-inspired aesthetics, the RM 47 demonstrates exceptional mechanical efficiency. The combination of titanium and gold composites optimizes the torque-to-weight ratio, minimizing friction over the eight full cycles of the mainspring.

Watches with long power reserves not only provide practical convenience—requiring less frequent winding—but also reflect the technical mastery behind their construction. As a thoughtful choice for International Men’s Day, a timepiece with extended energy autonomy embodies endurance, precision, and consistency, which are qualities that define the modern man.

If you’re considering a luxury timepiece as a meaningful gift, a long power reserve ensures reliable performance even when the watch is not worn regularly, symbolizing resilience and steadfastness.

Explore Luxehouze’s curated selection of men’s watches with exceptional movements and extended power reserves!