HydroConquest
The most widely recognized sports/diver line in the Longines catalog.
39mm Model
- Case size: 39mm
- Thickness: 11.9mm
- Lug width: 21mm
- Water resistance: 300m
- Crystal: Sapphire
41mm Model
- Case size: 41mm
- Thickness: 12.5mm
- Lug width: 21mm
- Water resistance: 300m
- Crystal: Sapphire
43mm Model
- Case size: 43mm
- Thickness: 13mm
- Lug width: 22mm
- Water resistance: 300m
- Crystal: Sapphire
The HydroConquest is the most tool-oriented case design in the lineup, with proportions built around dive functionality rather than dress balance.
Conquest
A more everyday sports watch that sits between dress and diver categories.
38mm Model
- Case size: 38mm
- Thickness: 10.9mm
- Lug width: 19mm
- Water resistance: 100m
- Crystal: Sapphire
41mm Model
- Case size: 41mm
- Thickness: 11.7mm
- Lug width: 21mm
- Water resistance: 100m
- Crystal: Sapphire
Compared to the HydroConquest, the Conquest line is thinner and more restrained, with less aggressive bezel presence and a flatter case profile.
Flagship Heritage
The dress-focused collection with more traditional proportions.
Standard Automatic Model
- Case size: 38.5mm
- Thickness: 10.3mm
- Lug width: 19mm
- Water resistance: 30m
- Crystal: Domed sapphire
Moonphase Model
- Case size: 38.5mm
- Thickness: 12.4mm
- Lug width: 19mm
- Water resistance: 30m
- Crystal: Domed sapphire
This is where Longines shifts toward vintage-inspired proportions, including tighter lug spacing and more vertical case stacking.
Master Collection
The most complication-heavy line in the Longines range.
Time & Date Models
- Case size: 40mm
- Thickness: 11.2mm
- Lug width: 21mm
- Water resistance: 30m
- Crystal: Sapphire
Chronograph / Moonphase Models
- Case size: 42mm
- Thickness: 14mm
- Lug width: 21mm
- Water resistance: 50m
- Crystal: Sapphire
Because of moonphase, chronograph, and calendar configurations, this is the collection with the most variation in case height and dial layering.
Spirit Collection
Pilot-inspired watches with balanced sport/dress proportions.
37mm Model
- Case size: 37mm
- Thickness: 11.7mm
- Lug width: 19mm
- Water resistance: 100m
- Crystal: Sapphire
40mm Model
- Case size: 40mm
- Thickness: 12.2mm
- Lug width: 21mm
- Water resistance: 100m
- Crystal: Sapphire
42mm Model
- Case size: 42mm
- Thickness: 13mm
- Lug width: 22mm
- Water resistance: 100m
- Crystal: Sapphire
The Spirit line tends to wear flatter than its specs suggest due to straight lug geometry and balanced dial layout.
Key Pattern Across Longines
Across the entire catalog, a few consistent structural traits show up:
- Most watches sit between 38mm and 42mm
- Thickness is usually kept under 13mm unless complications increase it
- Lug widths scale directly with case size
- 100m to 300m water resistance defines the sports vs dress split
- Sapphire crystal is standard across nearly all modern models
The Bottom Line
Longines is defined less by extreme specs and more by consistency.
Across collections, the differences come from case height, complication layering, and bezel presence—not radical changes in size or architecture.
That’s what makes the brand easy to wear and easy to compare across models.