Panerai Luminor 31 Giorni PAM01631: The Dive Watch With a Month-Long Power Reserve
Panerai has once again pushed the boundaries of mechanical watchmaking with the introduction of the Luminor 31 Giorni PAM01631, a professional dive watch boasting an extraordinary 31-day power reserve. Debuted at Watches & Wonders 2026, this remarkable timepiece represents the longest power reserve ever achieved in a Panerai Luminor model, cementing the Italian brand's legacy of extended autonomy that dates back to the mid-1950s.
Heritage Meets Innovation
The 44mm cushion-shaped case of the PAM01631 is crafted from Panerai's proprietary Goldtech alloy, a blend of 18k rose gold enhanced with copper, platinum, and silver for improved durability and color retention. The watch features the collection's signature crown-protector bridge at 3 o'clock, a domed sapphire crystal, and a screw-down display caseback, with water resistance rated at 100 meters.
Technical Specifications
| Reference | PAM01631 |
| Case Diameter | 44mm |
| Case Material | 18k Rose Gold (Goldtech) |
| Movement | Caliber P.2031/S (Manual-wind) |
| Power Reserve | 31 Days (744 hours) |
| Frequency | 21,600 vph (3Hz) |
| Jewels | 25 |
| Water Resistance | 100 meters |
| Limited Edition | 200 pieces |
| Price | $107,000 USD |
Movement Engineering
The heart of the Luminor 31 Giorni is the manual-wind Caliber P.2031/S, which houses four mainspring barrels connected to achieve a total mainspring length of 3.3 meters. Despite this enormous energy storage, Panerai has engineered the movement so that a full 31-day wind can be achieved through just 128 crown rotations—a remarkable feat of engineering that eliminates the need for specialized winding tools.
The movement incorporates a proprietary Torque Limiter system that selects an optimal 31-day operational window from a potential 36-day reserve, ensuring maximum accuracy throughout the entire power duration. After 31 days, the movement deliberately halts to maintain precision.
Polarized Date Display Technology
The PAM01631 features Panerai's innovative polarized date disc, which allows the date to be displayed without an opaque calendar ring obscuring the skeletonized movement beneath. The transparent disc with transparent numerals works in conjunction with a polarized window to reveal the current date through the trapezoid-shaped aperture at 3 o'clock.
Luminor Dive Watch Lineup 2026
- Panerai Luminor 31 Giorni PAM01631 (Month-long power reserve)
- Panerai Luminor PAM01731 and Destro PAM01732 (Heritage design, 40mm)
- Panerai Luminor Marina PAM01707 in Carbotech
- Panerai Luminor Luna Rossa Chrono PAM01768
- Panerai Luminor Marina Bronzo PAM01678 (First bronze Luminor Marina)
Frequently Asked Questions
Q: How long does the Panerai Luminor 31 Giorni power reserve actually last?
A: The Caliber P.2031/S offers a genuine 31-day (744-hour) power reserve, supported by four mainspring barrels with a combined length of 3.3 meters.
Q: Is the PAM01631 suitable for professional diving?
A: While rated to 100 meters water resistance, the Luminor 31 Giorni is more of a luxury dive-inspired watch. For professional diving applications, Panerai's Submersible line offers depths up to 500 meters.
Q: How many pieces will be produced?
A: The Luminor 31 Giorni PAM01631 is a limited edition of 200 pieces worldwide, with a retail price of $107,000 USD.
Source: aBlogtoWatch, April 13, 2026