A. Lange and Sohne 31 Day Power Reserve Rhodium Platinum

More about 31 Day Power Reserve Rhodium Platinum

This is a platinum A. Lange & Sohne 31 Day 130.025. It has an alligator leather strap with a unique platinum double fold deployment buckle, and a scratch resistant sapphire crystal. There is a screw down winding crown, and an exhibition sapphire display case back secured with 6 screws, and engraved with "A. LANGE & SOHNE – GLASHUTTE," a serial number, and several hallmarks. There is a circular keyhole for the winding key system on the solid part of the case back that's sealed with 3 gaskets insuring water resistance. It is not wound by the crown, but by a winding key that fits into a matching aperture on the case. The key has a built-in torque sensor that knows when the watch is almost fully wound, and it senses the increase in tension and disengages the ratchet key. The 45.9mm diameter solid three-body case, curved lugs, and concave cupped bezel, are polished. The dial is rhodium silver with applied faceted 18k white gold hour markers, around a perimeter minute scale. It has polished white gold epee hands, and there is a recessed silver subsidiary running small seconds dial at 6 o'clock. A silver-rimmed double-window quick set Big date aperture is at 10 o'clock, and it's operated by a rectangular button on the case edge at 10 o'clock. There is a railroad-style scale at 3 o'clock for the 31-day, 744-hour power reserve - the first to last an entire month. It's water resistant to 30 meters/100 feet, and the 15.9mm thick case, dial, and movement are all signed. This A. Lange & Sohne 31 Day 130.025 has a mechanical manual winding Lange caliber L034.1 movement. It's three-quarter plate with Cotes de Geneve ribbing, and it's constructed with 62 jewels including 61 rubies and one transparent sapphire. It has 406 components, blued screws, three screwed gold chatons, a whiplash precision index adjuster on a hand-engraved balance cock, and two stacked mainspring barrels with each accommodating an 1850mm spring (10 times longer than a conventional wristwatch). At full tension the twin barrels store over 3 Joules of energy, and the constant force escapement provides continuous energy from the mainspring without any loss of accuracy. The mechanism oscillates at a frequency of 21,600 vph (3 Hz). The A. Lange & Sohne 31 Day 130.025 was introduced at the SIHH exhibition in 2009.

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