Longines HydroConquest Hydroconquest Automatic 39

Reference L3.648.4.96.6

About this watch

The Longines Hydroconquest Automatic 39 (model L3.648.4.96.6) is a stunning blend of elegance and functionality, featuring a modified ETA 2824-2 movement with a power reserve of around 38 hours. The watch boasts a robust stainless steel case, a rotating dive bezel marked from 0-60, and a sapphire crystal glass that provides excellent clarity. With a water resistance of up to 300 meters, this timepiece is built to handle serious underwater conditions. The blue dial features stick and dot indexes that enhance readability while maintaining an elegant look. The luminous hands ensure you can easily tell the time in low-light conditions—essential for any diver. When stacked against other dive watches in its price range, the Hydroconquest holds its own remarkably, bringing a certain elegance that is hard to match. Whether you're a seasoned diver or simply someone who appreciates the finer things in life, this watch will not disappoint.

Buy Now on Jomashop

This is an affiliate link

Key Features

Modified ETA 2824-2 movement
Stainless steel case with rotating dive bezel
Sapphire crystal glass for excellent clarity

Specifications

Brand

Longines

Family

HydroConquest

Model

Hydroconquest Automatic 39

Reference

L3.648.4.96.6

Movement

l633-5

Movement Features

Hours, Minutes, Seconds
Date

Case

Stainless Steel 39mm

Dial Color

Blue

Crystal

Sapphire

Water Resistance

300

Current Listings

Longines Hydroconquest Blue 39mm - $1150

Longines - Hydroconquest · $1,150

A blue dial Longines Hydroconquest 39mm watch with a full kit, in excellent condition and keeping good time.

Condition: Great condition
Year purchased: 2025
Warranty duration: 5 years

Posted at

Mar 1, 2026, 8:14 PM

Active

View listing on r/WatchExchange

Longines Hydroconquest 41mm Two Tone

Longines - Hydroconquest 41mm Two Tone · $999

A Longines Hydroconquest 41mm Two Tone watch with a black dial and two tone finish. It is in very good condition with some minor wear.

Condition: Very Good Pre Owned Condition
Diameter: 41mm

Posted at

Feb 27, 2026, 3:34 PM

Active

View listing on r/WatchExchange

Longines HydroConquest GMT 41mm L3.790.4

Longines - L3.790.4 · $1,799

This Longines HydroConquest GMT is a 41mm watch featuring a 6.5 inch bracelet and an aftermarket rubber strap with deployant.

Bracelet Length: 6.5 inches
Case Size: 41mm

Posted at

Feb 19, 2026, 5:35 PM

Active

View listing on r/WatchExchange

Longines HydroConquest 43mm Automatic – Black Dial – Full Kit – $1,095

Longines - L3.782.4 · $1,095

This Longines HydroConquest automatic watch features a black dial and 43mm case size, which provides a strong wrist presence.

Condition: very good
Case size: 43mm diameter
Case wear: normal wear consistent with careful use

Posted at

Feb 18, 2026, 4:40 PM

Active

View listing on r/WatchExchange

Longines Hydroconquest 41m Green full kit with OEM bracelet and rubber strap

Longines - Hydroconquest 41m · $975

A green ceramic automatic watch from Longines, part of the Hydroconquest series, featuring a Swiss movement with 72-hour power reserve.

Condition: Used with signs of wear
Case diameter: 41 mm
Water resistance: 300m / 30 bar
Movement: Longines Calibre L888 series with 72hr power reserve

Posted at

Feb 16, 2026, 4:12 PM

Active

View listing on r/WatchExchange

Longines HydroConquest, L3.781.4.06.9, Steel Diver, Olive, Excellent Condition.

Longines - L3.781.4.06.9 · $1,095

This Longines HydroConquest is a steel diver's watch with an olive green matte dial and a unidirectional rotating ceramic bezel. The stainless steel case measures 41mm in diameter and has a water resistance of up to 300 meters.

Condition: Excellent Condition
Case Diameter: 41mm
Thickness: 11.9mm
Bezel Type: Unidirectional rotating Green Ceramic

Posted at

Feb 5, 2025, 2:47 AM

Active

View listing on RolexForums