A. LANGE REF. 310.021 LANGEMATIC PERPETUAL CALENDAR YELLOW GOLD
A. Lange & Söhne, Glashütte i./Sa., Langematik Perpetual, movement No. 28010, case No. 138069, Ref. 310.021. Production of this reference started
Very fine and rare, self-winding, water-resistant, 18K yellow gold wristwatch with perpetual calendar, leap year indication, oversized date, 24-hour
indication, moon phases and an 18K yellow gold Lange buckle. Accompanied by a fitted box with winding facilities.
Three-body, solid, polished and brushed, rounded bezel, transparent case back with 6 screws, sapphire crystals, correctors on the band.
Solid silver with applied radial yellow gold Roman numerals, subsidiary dials for the days of the week, the months, the leap year, the 24 hours
with day/night indication and the seconds, apertures for the oversized date at 12 and the moon phases at 6. Luminous yellow gold alpha hands.
Cal. L922.1 Sax-O-Mat with zero-reset feature, Glashütte 3/4 plate in German silver, fausses cotes decoration, 43 jewels, straight line lever
escapement, monometallic balance adjusted to 5 positions, shock absorber, self-compensating flat balance spring, swan neck micrometer regulator,
21K gold bi-directional micro-rotor with platinum segment, hand-engraved balance bridge.