Panerai
Luminor 31 Giorni
Panerai's power-reserve ladder, by the brand's own account: the Cortébert 663 and 618 in the early references ran roughly 36 to 40 hours; the reinforced 6152-1 reached 42 to 46; the GPF 2/56 of the mid-1950s adopted the Angelus SF 240 and its eight days; the in-house P.2002 (2005) kept eight days on a patented three-spring barrel design, the automatic P.2003 (2007) reached ten, and the P.2031/S now runs thirty-one.
Specification
Case
- Size
- 44 mm
- Material
- Panerai Goldtech (gold and copper alloy with platinum and silver), brushed; polished bezel
- Water Resistance
- 10 bar (about 100 m)
- Notable
- crown-protecting bridge; tested 25% beyond the depth rating
- Caseback
- Goldtech, with a see-through sapphire viewing window
Movement
- Calibre
- P.2031/S
- Type
- hand-wound skeleton
- Functions
- hours, minutes, small seconds (at 9), date, power reserve indicator
- Components
- 276
- Jewels
- 25
- Notable
- four barrels in series holding 3.3 metres of mainsprings; 31-day power reserve selected by a patent-pending Torque Limiter from a potential 36-day reserve (the movement halts itself after day 31); full wind in 128 crown turns; patented jumping hour hand sets hours without disturbing minutes and seconds; patented polarised date disc visible only through the 3 o'clock window
- Power Reserve
- 31 days (744 hours)
- Frequency
- 21,600 alternations/hour (3 Hz by conversion)
- Height
- 10.06 mm
- Diameter
- 15 3/4 lignes
- Balance
- Glucydur
- Shock Protection
- Incabloc
- Hacking
- stop balance mechanism
Details
- Dial
- skeletonised over the exposed movement; rehaut marked at 12 and 6 only; indexes and hands in white Super-LumiNova X2 with golden surrounds; curved power reserve indicator along the calibre's perimeter
- Straps
- black alligator and rubber straps, tool-free swap via the PAM Click Release System on a Goldtech folding clasp