A. Lange and Sohne 109.021 Lange 1 Moon 18K Yellow Gold (34839)

34839 A. Lange & Sohne 109.021 Lange 1 Moonphase, 109021, 18k yellow gold on a strap with an 18k yellow gold buckle, manual wind, silver dial, patented large date at 2 o'clock, power reserve indicator, small seconds, moonphase, display back, sapphire crystal, water resistant to 3 atm, diameter: 38.5mm, thickness: 10.4mm, Like New with original box and papers dated Aug / 2004. The watch was just completely serviced.


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More about A. Lange and Sohne 109.021 Lange 1 Moon 18K Yellow Gold

This is an 18K yellow gold A. Lange & Sohne Lange 1 Moon phase, 109.021. The alligator strap has an 18k yellow Gold Buckle, and a scratch resistant sapphire crystal. The 38.5mm diameter solid three-body case is polished and brushed with a rounded bezel, curved lugs, and a sapphire crystal display case back secured with 6 screws. The dial is silver with applied rose gold Roman numeral hour markers at the quarter hours, diamond-shaped indexes, and luminous alpha hands. There is a small seconds sub dial inside the moon phase aperture, and a pushbutton for correcting the date at 10 o'clock, with a large double-date aperture at 1 o'clock, and a 72-hour power reserve sector at 3. It's water resistant to 30 meters/100 feet, and the 10.4mm thick case, dial, and movement are all signed.

The manual winding Lange calibre L 901.5 movement is Glashütte (untreated German silver) 3/4 plate, with fausses cotes embellishment. It's constructed with 54 jewels and includes 9 screw-mounted gold chatons, a straight-line lever escapement, and a monometallic balance adjusted to cold, heat, and 5 positions, There is a self-compensating flat balance spring, a swan neck micrometer regulator, a hand engraved balance bridge and fan-shaped balance cock, a shock absorber mechanism, and an omega-shaped whiplash precision index adjuster.

The moon phase display of this watch reproduces the progression of the moon in two ways: The lunar disc continuously revolves, making it so precise that it only deviates one day after having run without interruption for 122.6 years.