Longines HydroConquest 39mm
(Ref. L3.779.4.56.6) Black Dial on H-Link Bracelet
2026
Automatic
2,200 $Loading shared data...
2026Automatic2,200 $Overall Score
A
92 / 100
The 2026 HydroConquest 39mm is a masterclass in refinement, shedding the 'cartoonish' oversized numerals of its predecessor for a sleek, modern aesthetic. With a thinner 11.7mm profile and a high-spec silicon-equipped movement, it is arguably the best value-for-money Swiss diver in the sub-$2,500 category.
Movement Quality
Automatic
TypeA
5 sec/day
AccuracyVery high
ReliabilityMaterials & Build
~166g
Total WeightA
Stainless Steel
Case MaterialSapphire
CrystalExcellent
Build Quality300m
Water ResistanceMaintenance & Risks
6-8years
Service IntervalA
250-450 $
Service CostVery high
Parts AvailabilityHighly serviceable by any Swatch Group center or qualified independent watchmaker due to the ETA-based architecture
Serviceability1. 19mm lug width limits strap options
2. Polished center links prone to scratches
Known Weak PointsValue for Money
2,200
$
List PriceA
1,850
$
Resale AverageHigh
Market LiquidityGood
Longines maintains strong secondary demand, typically retaining 75-85% of value.
Holding ValueGood
Value for wearerMixed
Value for collectorGood
Beats most competitors in thickness and movement specs at this price point.
Spec EfficiencyAlternatives
Tudor Black Bay 54
MT5400
3,900 $
Oris Aquis Date 39.5
Oris 733
2,300 $
Christopher Ward C60 Trident Pro 300
Sellita SW200-1
1,050 $