- Movement
- Manually wound
- Size
- 41.5 mm
Overview
The Datograph Perpetual Tourbillon HONEYGOLD® “Lumen”
The A. Lange & Söhne Datograph Perpetual Tourbillon HONEYGOLD® “Lumen”, reference 740.055FE, in an 18-carat HONEYGOLD® case, 41.5 mm across and 14.6 mm high, with a semi-transparent sapphire crystal dial. Manually wound calibre L952.4 with tourbillon and chronograph, on a dark brown alligator leather strap with a HONEYGOLD® and white gold deployant buckle.
Lange says the Datograph Perpetual Tourbillon HONEYGOLD® “Lumen” combines three complications in an 18-carat HONEYGOLD® case: a tourbillon with a stop-seconds mechanism, a perpetual calendar and a flyback chronograph. It adds that all the displays are luminous.
The dial is a semi-transparent sapphire crystal, and Lange limits this version to 50 pieces. The movement is calibre L952.4, manually wound, with 684 parts, a reserve of 50 hours and a balance beating at 18,000 semi-oscillations an hour (2.5 Hz). Lange lists the outsize date, day/night indicator, moon-phase display, tourbillon, chronograph, day-of-week display and perpetual calendar. The case is 14.6 mm high, water resistant to 3 bar, with a sapphire glass case back. The strap is dark brown alligator leather, closed with a deployant buckle in HONEYGOLD® and white gold.
Key details
Design and engineering
- DialA semi-transparent dial in sapphire crystal. Lange says all the displays are luminous.
- TourbillonLange gives the tourbillon a stop-seconds mechanism and lists it among the functions of calibre L952.4.
- ChronographDescribed by Lange as a flyback chronograph, one of the three complications it names for the model.
- Case18-carat HONEYGOLD®, 41.5 mm across and 14.6 mm high, with a sapphire glass case back and water resistance of 3 bar.
- Strap and buckleDark brown alligator leather, closed with a deployant buckle in HONEYGOLD® and white gold.
Calibre L952.4
- Manually wound
- Outsize date, day/night indicator, moon-phase display, tourbillon, chronograph, day-of-week display and perpetual calendar
- 684 parts
- 18,000 semi-oscillations per hour (2.5 Hz)
- Power reserve 50 hours
The reference
Technical specifications
| Reference | 740.055FE |
|---|---|
| Collection | Saxonia |
| Calibre | L952.4 |
| Movement | Manually wound |
| Functions | Outsize date, day/night indicator, moon-phase display, tourbillon, chronograph, day-of-week display, perpetual calendar |
| Power reserve | 50 hours |
| Frequency | 18,000 semi-oscillations per hour (2.5 Hz) |
| Movement parts | 684 |
| Case dimensions | 41.5 mm |
| Case height | 14.6 mm |
| Case material | 18-carat HONEYGOLD® |
| Case back | Sapphire glass |
| Water resistance | 3 bar |
| Dial | Semi-transparent sapphire crystal |
| Strap | Dark brown alligator leather |
| Clasp | 750 HONEYGOLD®, 750 white gold deployant buckle |
| Limited edition | 50 pieces |
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