Description
The A. Lange & Söhne Grand Lange 1 Moonphase 139.025 stands as a testament to the pinnacle of German watchmaking excellence, embodying centuries of horological tradition combined with modern innovation and astronomical complications.
Technical Specifications
Case Dimensions:
- Diameter: 41.0mm
- Height: 9.4mm
- Material: 950 Platinum
- Water resistance: 3 bar (30 meters)
Movement Specifications:
- Caliber: L095.3
- Manually wound
- Frequency: 21,600 semi-oscillations per hour (3 Hz)
- Number of parts: 446
- Number of jewels: 45
- Power reserve: 72 hours when fully wound
Dial and Display Features
The solid silver dial showcases multiple sophisticated elements:
- Off-center main time display with hour and minute hands
- Outsize date display at 1 o’clock position
- Small seconds subdial with integrated power reserve indicator
- High-precision moonphase display at 7 o’clock
- Lancet-shaped hands in polished white gold
- Applied hour markers in solid gold
Moonphase Mechanism
The moonphase display is a technical marvel:
- Accurate to 122.6 years before requiring adjustment
- Features a precision reduction gear ratio of 180/29
- Display disk crafted from solid gold with traditional goldsmith techniques
- 393 stars hand-engraved on the celestial disc
Movement Architecture and Finishing
The movement exemplifies traditional Glashütte watchmaking:
- Three-quarter plate in untreated German silver
- Hand-engraved balance cock with whiplash spring
- Screwed gold chatons securing the jewel bearings
- Classic screw balance with eccentric poising weights
- Swan-neck fine adjustment mechanism
- Flat polished escape-wheel cap
Finishing Details
Every component receives meticulous attention:
- Movement parts hand-finished and decorated twice
- Stripe decoration (Glashütte ribbing) on German silver plates
- Perlage on the base plate
- Hand-polished chamfers on all edges
- Straight-grained finish on steel parts
- Black-polished steel parts for chronometer screws
Strap and Buckle
The watch comes with:
- Hand-stitched alligator leather strap in dark brown
- 950 platinum deployant buckle with safety push-pieces
- Hand-finished buckle matching case quality
Limited Production and Exclusivity
Each piece represents countless hours of handwork by master watchmakers. The platinum version is produced in extremely limited quantities, making it one of the most exclusive timepieces in the haute horology segment.
Investment Value
As a collectible timepiece, the Grand Lange 1 Moonphase 139.025 holds significant value due to:
- Use of precious metals (950 platinum)
- Limited production numbers
- Complex in-house movement
- Brand heritage and prestige
- High level of hand-finishing
Service and Maintenance
The watch requires regular maintenance every 4-5 years by authorized A. Lange & Söhne watchmakers to ensure optimal performance and longevity. Each service includes complete disassembly, cleaning, and reassembly of the movement, along with timing adjustments and water resistance testing.
The Grand Lange 1 Moonphase 139.025 represents not just a timepiece, but a masterwork of mechanical art that showcases the highest standards of German watchmaking tradition and innovation.
