Specifications
- Reference
- L3.781.4.56.6
- Family
- HydroConquest
- Category
- Dive
- Status
- Current
- Case material
- Stainless steel
- Case diameter
- 41 mm
- Case thickness
- 11.9 mm Third-party
- Lug-to-lug
- 51.1 mm Third-party
- Lug width
- —
- Water resistance
- 300 m
- Bezel
- Rotating, diver
- Calibre
- L888 Third-party
- 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 51.1 mm on a flat top of 54.1 mm: 95 % 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 |
|---|---|---|---|
| 11.9 mm | Third-party | Hourstriker | October 14, 2026 |
Lug-to-lug
| Value | Type | Source | Date |
|---|---|---|---|
| 51.1 mm | Third-party | Hourstriker | 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
Third-party Hourstriker · 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.
Other Longines models
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Legend Diver L3.774.4.30.2 | 42 mm | — | — | — |
| HydroConquest GMT L3.790.4.56.6 | 41 mm | — | — | L844 |
| Spirit Zulu Time L3.812.4.63.6 | 42 mm | 13.9 mm | 49 mm | L844 |
| Master Collection L2.793.4.59.6 | 40 mm | — | — | — |