A. LANGE & SOHNE REF. 310.021
LANGEMATIC PERPETUAL CALENDAR
A. Lange & Söhne, Glashütte i./Sa., Langematik
Perpetual, movement No. 28301, case No.
138211, Ref. 310.021. Production of this reference
started in 2001.
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 & Sohne folding buckle.
Three-body, solid, polished and brushed,
rounded bezel, transparent case back with 6
screws, sapphire crystals, correctors on the
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
in German, apertures for the oversized
date at 12 and the moon phases at 6. Luminous
yellow gold alpha hands.
Cal. D922.1 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.