- Movement
- Self-winding
- Size
- 40 mm
Overview
Calibre L921.4 in a 40 mm case
The A. Lange & Söhne Grand Langematik, reference 309.025, in a 950 platinum case, 40 mm across and 10.7 mm high, with a rhodié dial. Self-winding calibre L921.4 with outsize date and ZERO-RESET mechanism, on a black alligator leather strap with a platinum prong buckle.
A. Lange & Söhne no longer makes this reference. This execution has a rhodié dial and a black alligator leather strap with a platinum prong buckle.
The movement is calibre L921.4, self-winding, with 378 parts and a reserve of 46 hours; the balance beats at 21,600 semi-oscillations an hour (3.0 Hz). Lange lists the outsize date and the ZERO-RESET mechanism as its functions. The case is 10.7 mm high, water resistant to 3 bar, with a sapphire glass case back. The strap is alligator leather, closed with a prong buckle in the case metal.
Key details
Calibre L921.4
- Self-winding
- Outsize date and ZERO-RESET mechanism
- 378 parts
- 21,600 semi-oscillations per hour (3.0 Hz)
- Power reserve 46 hours
The reference
Technical specifications
| Reference | 309.025 |
|---|---|
| Collection | Saxonia |
| Calibre | L921.4 |
| Movement | Self-winding |
| Functions | Outsize date, ZERO-RESET mechanism |
| Power reserve | 46 hours |
| Frequency | 21,600 semi-oscillations per hour (3.0 Hz) |
| Movement parts | 378 |
| Case dimensions | 40 mm |
| Case height | 10.7 mm |
| Case material | 950 platinum |
| Case back | Sapphire glass |
| Water resistance | 3 bar |
| Dial | Rhodié |
| Strap | Black alligator leather |
| Clasp | 950 platinum prong buckle |
| Status | Discontinued — A. Lange & Söhne no longer makes this reference |
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