Specifications
- Reference
- L3.812.4.63.6
- Family
- Spirit
- Category
- GMT / travel
- Status
- Current
- Case material
- Stainless steel
- Case diameter
- 42 mm
- Case thickness
- 13.9 mm Third-party
- Lug-to-lug
- 49 mm Third-party
- Lug width
- —
- Water resistance
- 100 m
- Bezel
- Rotating, 24 h (GMT)
- Certifications
- COSC
- Calibre
- L844 Official
- Power reserve
- up to 72 h
- Frequency
- 25,200 vph (3.5 Hz)
Official product page · retrieved October 14, 2026
Does it fit your wrist?
Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.
Comfortable
Lug-to-lug 49 mm on a flat top of 54.1 mm: 91 % of the width.
Lug-to-lug is 75 to 95% of the flat top, the usual comfortable range.
Measurements and sources
Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.
Case thickness
| Value | Type | Source | Date |
|---|---|---|---|
| 13.9 mm | Third-party | Time+Tide Spec table in the review: 42 mm x 13.9 mm x 49 mm. | October 14, 2026 |
Lug-to-lug
| Value | Type | Source | Date |
|---|---|---|---|
| 49 mm | Third-party | Time+Tide Spec table in the review: 42 mm x 13.9 mm x 49 mm. | October 14, 2026 |
Lug width
Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.
No source gave this figure yet.
Calibre source
Official Longines · retrieved October 14, 2026
Other versions in the same case
These references differ only by dial, bracelet or bezel colour. The brand gives them the same case dimensions, so the figures on this page apply to them too.
Same brand in the data set
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| HydroConquest L3.781.4.56.6 | 41 mm | 11.9 mm | 51.1 mm | L888 |
| HydroConquest GMT L3.790.4.56.6 | 41 mm | — | — | L844 |
| Legend Diver L3.774.4.30.2 | 42 mm | — | — | — |
| Master Collection L2.793.4.59.6 | 40 mm | — | — | — |