A. Lange and Sohne 310.026 Langematik Perpetual Calendar Black Dial 18K White Gold (25129)

25129 A. Lange & Sohne 310.026 Langematik Perpetual Calendar 310026, 18K white gold on a strap with an 18K white gold buckle, automatic A. Lange & Sohne caliber L922.1, black dial with roman numerals, day, big date, month, moon phases, leap year, 24 hour indicator, display back, sapphire crystal, water resistant to 3 atm, size: 38.5 mm, Thickness: 11mm, Like New with original winding box, setting pin and certificate dated 12 / 2014.

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More about A. Lange and Sohne Reference No. 310.026

This is an 18k white gold A. Lange & Sohne Langematik Perpetual Calendar 310.026. It has an alligator leather strap with an 18k white gold tang buckle, and a scratch resistant sapphire crystal. It has an exhibition screw-down display sapphire case back secured with 6 screws, and correctors on the band. The 38.5mm diameter solid three-body case, rounded bezel, and downturned lugs are polished/brushed. This watch has a "Zero Reset" that resets the seconds hand to zero when you pull out the crown to adjust the time, making it extremely easy to precisely synchronize the watch The date correction is activated by either pressing one button to change all features collectively, or each complication can be corrected independently using recessed corrector buttons – there are three on the left side case band, and one is at 4 o'clock next to the winding crown. The dial is black with applied radial white gold Roman numeral hour markers, luminescent white gold alpha hands, and an outer railway-style minute track. There is a subsidiary dial for the day of the week that's combined with the 24-hours and day/night indication at the 9 o'clock position, and a constant small seconds sub dial combined with the moon phase at 6 o'clock. The sub dial at 3 o'clock registers the months and leap year. A large double-digit date aperture window is at 12 o'clock. It's water resistant to 30 meters/100 feet, and it has a power reserve of 46 hours at full wind. The 11mm thick case, dial, and movement are all signed.

This A. Lange & Sohne Langematik Perpetual Calendar 310.026 has a mechanical automatic self-winding A. Lange & Sohne caliber L922.1 "Sax-O-Mat" movement is Glashütte 3/4 plate in German silver, with fausses cotes embellishment. It has a shock absorber mechanism, and it's constructed with 43 jewels, a straight-line lever escapement, and a monometallic balance that's adjusted to temperatures and 5 positions. It includes a self-compensating flat balance spring, a swan neck micrometer regulator, a 21K gold bi-directional micro rotor with platinum segment, and a hand-engraved balance bridge. The rotor oscillates at a frequency of 21,600 vph (3 Hz).

The A. Lange & Sohne Langematik Perpetual Calendar 310.026 was introduced in 2001.