Photo: Tempus Shop
Catalogue / Longines / ref. L3.779.4.70.6
Longines HydroConquest 39mm Noir Mat - L3.779.4.70.6
The Longines HydroConquest 39mm Noir Mat is an automatic watch, 39 mm across, with a sapphire crystal, water-resistant to 300 m. It was listed at €2,300 at Tempus at our check on 12 November 2026.
Where to buyChecked 12 November 2026
The button leads to today’s price. Affiliate link: the retailer pays us a commission, at no extra cost to you.
Who it suits
Anyone who swims, dives or wants a watch that never needs babying.
Strengths
Automatic movement · Sapphire crystal · Water-resistant to 300 m
Limits
No limit found on the spec sheet.
Our view
A good choice at this price
Of 248 automatic watches within 20% of its price, none is better equipped (crystal, water resistance, titanium).
Depending on what you want
- If you want to spend less without losing anything on the spec sheet, the Alpina Seastrong Diver 300 Heritage Automatic AL-525S4H6 costs €1,795.
- If you like the model but not this version, see the Longines HydroConquest 39mm Bleu Givré, at €2,300.
Reading the spec sheet
What the spec sheet says
- Automatic movement. It winds itself on the wrist, with no battery.
- Sapphire crystal. The most scratch-resistant option.
- Water-resistant to 300 m. Swimming and diving without a second thought.
- Priced below the brand median. It costs 16% less than the median of the 383 automatic Longines watches in the catalogue (€2,750).
Analysis based on the retailer’s spec sheet, without handling the watch.
- Brand
- Longines
- Gender
- Men
- Case material
- Stainless steel, ceramic bezel
- Strap material
- Steel
- Diameter
- 39mm
- Crystal
- Sapphire, multi-layer anti-reflective coating
- Movement
- Automatic
- Water resistance
- 300 m (30 bar)
- Functions
- Date
- Dial colour
- Polished black lacquer
- Clasp
- Double-safety folding clasp
- Reference
- L3.779.4.70.6
At this price
Alternatives from other brands
Same type of movement, within 20% of the price.
Questions
The short answers
Is the Longines HydroConquest 39mm Noir Mat an automatic watch?
Yes. Its movement is automatic: it winds itself with the motion of the wrist.
Can you swim with the Longines HydroConquest 39mm Noir Mat?
Yes. It is water-resistant to 300 m, which covers swimming and diving.
Does the crystal of the Longines HydroConquest 39mm Noir Mat scratch?
It has a sapphire crystal, the most scratch-resistant kind.
What size is the Longines HydroConquest 39mm Noir Mat?
Its case measures 39 mm in diameter.
How much does the Longines HydroConquest 39mm Noir Mat cost?
It was listed at €2,300 at Tempus at our check on 12 November 2026.
Where it ranks
This watch appears in
- Auricoste SM300 Scuba Master vs Longines HydroConquest 39mm Noir MatHead to head · Auricoste
- Automatic watches with sapphire crystal, water-resistant to 100 m, under €3,000335 references
- Automatic dive watches under €3,000144 references
- Automatic watches, water-resistant to 100 m, under €3,000359 references
- Watches with sapphire crystal, water-resistant to 100 m, under €3,000456 references
- Automatic watches with sapphire crystal under €3,000666 references
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