Longines
Longines HydroConquest Quartz 39 Black / Red L3.688.4.59.6
The Longines HydroConquest Quartz 39 Black / Red (reference L3.688.4.59.6) is a 39 mm watch.
Specifications
Case
- Reference
- L3.688.4.59.6
- Collection
- HydroConquest
- Case size
- 39 mm
Movement
- Movement
- Quartz
Dial versions
This reference was made with these dials and finishes.
L3.688.4.59.6
How it compares within the HydroConquest family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| L3.688.4.59.6 (This watch) | 39 mm | — | — | — | — |
| L3.247.4.16.6 | 29.5 mm | — | White | — | — |
| L3.690.4.19.6 | — | — | — | — | — |
| L3.696.4.53.2 | — | — | — | — | — |
| L3.742.3.56.7 | 41 mm | Stainless steel / yellow gold | Black | — | — |
| L3.742.4.98.6 | 41 mm | Stainless steel | Blue | — | — |
| L3.780.4.56.6 | 39 mm | Stainless steel | Black | — | — |
| L3.781.4.76.9 | 41 mm | Stainless steel | Grey | — | — |
| L3.790.4.06.6 | 41 mm | Stainless steel | Green | — | — |
About the HydroConquest family
HydroConquest is Longines' main modern dive collection, introduced in 2007 and completely redesigned in 2018. Current models have a ceramic bezel insert, a screw-down crown, a water resistance of 300 metres and a range of case sizes, with chronographs and, since 2023, a GMT.
The catalog lists a very large number of references in steel and in steel with gold, which differ in case size, dial and bezel colour, and strap or bracelet. The final digit of the reference shows the bracelet or strap, so check it against the watch. HydroConquest is bought to be worn, so look at the bezel, crystal and bracelet for wear.
Quick answers
- What size is the Longines HydroConquest Quartz 39 Black / Red L3.688.4.59.6?
- The Longines HydroConquest Quartz 39 Black / Red L3.688.4.59.6 has a 39 mm case.
Catalog facts checked October 2026.