Longines L3.779.4.56.6
What Should You Pay?
Estimated fair market values. Actual prices vary by condition, completeness, and seller.
New / Like New / Full Kit
$1,809 – $2,256
high confidence
Excellent / Pre-Owned
$1,520 – $1,896
high confidence
Used / Watch Only
$1,231 – $1,536
high confidence
Fair Market Value
$1,708
Blended estimate for excellent condition
Recent Comparable Listings
The Longines HydroConquest L3.779.4.56.6 is a 39mm stainless steel dive watch featuring a black lacquered polished dial, ceramic bezel, and automatic movement with date function. It is part of the HydroConquest collection known for its robust construction and sporty design.
Specifications
Case Diameter 39 mm
Case Material stainless steel
Case Shape round
Case Back solid
Water Resistance 300m
Crystal sapphire
Bezel Type rotating_unidirectional
Bezel Material ceramic
Dial Color black
Dial Indexes applied
Bracelet/Strap oyster
Bracelet Material stainless steel
Clasp deployant
Complications date
More from HydroConquest
View all HydroConquest references →
Related Guides & Articles
Market Research
Best Secondhand Watch Deals Right Now
The best deals on pre-owned watches this month — undervalued models from Rolex, Omega, Tudor, Seiko, and more, with current market prices and why they're worth buying.
Mar 7, 2026
Buyer's GuidePre-Owned Longines: Buying Guide & Prices
How to buy a secondhand Longines — from the Spirit to the HydroConquest, with pre-owned prices and the best value picks in the collection.
Mar 4, 2026