A. Lange and Sohne Grand Langematik Date YG
A. Lange & Sohne 309.021, Grand Langematik Big Date, Reference 309.021, 18K Yellow Gold Case on a Strap with an 18K Yellow Gold Buckle, Automatic Movement (Lange cal. L921.4 SAX-O-Mat), Silver Dial with Polished Gold Luminous Hands, Small Seconds, Big Date Indicator at 12 O'Clock, Diameter: 40mm, Thickness: 9.7mm, Display Back, Sapphire Crystal, Water Resistant to 3 atm, 46 Hours Power Reserve, Like New with Original Box and Papers.
More about Grand Langematik Date YG
This is an 18K yellow gold A. Lange & Sohne Grand Langematik Big Date 309.021. It has an alligator leather strap with an 18K yellow gold buckle, and a scratch resistant sapphire crystal. There is a rectangular pushbutton for correcting the date display on the case at the 10 o'clock position. The 40mm diameter solid three-body case, curved bezel, and downturned lugs are polished. There is an exhibition transparent sapphire case back secured with 6 screws. The dial is silver with gold applied faceted baton hour makers, black painted minute index markers, and rhodium plated yellow gold lancet hands with tritium inserts. There is a constant small seconds subsidiary dial at 6 o'clock, and two large double date aperture windows underneath 12 o'clock. It's water resistant to 30 meters/100 feet, it has a power reserve 46-hours, and the 9.7mm thick case, dial, and movement are all signed. This A. Lange & Sohne Grand Langematik Big Date 309.021 has a mechanical automatic self-winding A. Lange & Sohne caliber 921.4 SAX-O-MAT movement. It's made from Glashütte 3/4 plate in German silver, with fausses cotes embellishment. It has an embossed bi-directional winding three quarter rotor in 21ct gold and platinum, with 4 ball bearings in the gear change. It has a shock absorber mechanism, and it's constructed with 45 jewels. It includes a straight-line lever escapement, a monometallic Glucydor srewed balance that's adjusted for temperature and 5 positions, a beat adjustment with a micrometer screw, and a self-compensating flat balance spring. It has a Nivaroz hairspring with a swan-neck precision regulator, bridges with Glasshute ribbing, and a hand-engraved balance bridge. It has a hacking seconds device with automatic zeroing of the seconds hand (zero reset) when pulling the crown. The mechanism oscillates at a frequency of 21,600 VPH (3 HZ). The A. Lange & Sohne Grand Langematik Big Date 309.021 was introduced in the 2000's.
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