Longines model

Longines HydroConquest: history, models and official videos

The Longines HydroConquest is the brand's dive watch, on sale since 2007 and built on the older Conquest line. This page explains its main versions, what to check on yours and what drives its value, and shows the official Longines videos.

Introduced: 2007
Case sizes: 39, 41, 43 and 44 mm (varies by version)
Movement: Quartz L157; automatic L888; chronograph L688; GMT L844.5
Water resistance: 300 m

LONGINES HYDROCONQUEST – official video by Longines on YouTube

Where the HydroConquest comes from

The HydroConquest was introduced in 2007 as Longines' diving watch. It builds on the Conquest, a name Longines first registered in 1954. Longines itself was founded in 1832 in Saint-Imier. Watch media have called the HydroConquest the brand's flagship dive watch, and it has stayed in the range ever since, in many sizes, colors and versions.

Sizes, movements and versions

The HydroConquest is a family, not a single watch. You will mainly meet these lines:

Quartz: steel watches with the ETA-based calibre L157, offered in 39, 41 and 44 mm in earlier years.
Automatic: the calibre L888, a Longines movement based on an ETA base, beating at 25,200 vibrations per hour with a 72-hour power reserve.
Chronograph: introduced in 2011 in a 43 mm case with the automatic calibre L688, a column-wheel movement.
Black ceramic: a 43 mm version from 2019 with a case made of zirconium oxide ceramic.
GMT: a 41 mm watch with the calibre L844.5, which adds a second time zone. A redesigned version with new dial, caseback and bracelet appeared in 2023.

Most models have a 300-meter water resistance rating, a screw-down crown and caseback, and a unidirectional rotating bezel with a 60-minute scale. Early watches had aluminum bezel inserts; according to one retailer's guide, ceramic bezels have replaced them since 2018. Dials come in black, blue, green and gray, and two-tone versions with gold-colored PVD exist as well.

How to tell versions apart

Check three things. First, the movement: a quartz watch has a battery and a ticking seconds hand, an automatic has a sweeping seconds hand. Second, the case size, which you can measure across the case without the crown. Third, the reference number engraved on the caseback, which you can match against Longines documentation or your papers. If the dial, bezel or bracelet looks mismatched, the watch may have been repaired with non-original parts.

What is a Longines HydroConquest worth?

The HydroConquest is a modern, mid-priced sports watch, so values are far lower than for collector pieces. What matters most is the version (quartz, automatic, chronograph, GMT or ceramic), the condition of bezel and bracelet, service history, and whether the box and papers are present. Automatic and chronograph models usually sit above quartz ones in the same size. We found no documented auction results for the HydroConquest, so we do not quote any record prices.

Own a HydroConquest? Upload a few photos and get a free value estimate: estimate my Longines HydroConquest · How much is my watch worth?

Official Longines HydroConquest videos

All videos come from the official Longines YouTube channel. They show the current HydroConquest models, including the GMT and special editions.

More Longines videos, sorted by model: all official Longines playlists.

Sources (5)

SwissWatchExperts is not affiliated with Longines. Brand and model names are trademarks of their owners; the videos are embedded from the official Longines YouTube channel.

← Longines: history, models and value

Frequently asked questions

When was the Longines HydroConquest introduced?

Longines introduced the HydroConquest in 2007. It builds on the Conquest line, a name registered in 1954.

How big is a Longines HydroConquest?

It depends on the version. Sources list 39, 41 and 44 mm for the steel quartz and automatic watches, 39, 41 and 43 mm for ceramic-bezel models, and 43 mm for the chronograph and black ceramic watch.

Which movement does a HydroConquest have?

Quartz models use the calibre L157. Automatics use the calibre L888 with a 72-hour power reserve, the chronograph uses the L688 and the GMT uses the L844.5.

Is the Longines HydroConquest a real dive watch?

It is rated to 300 meters and has a screw-down crown and a unidirectional bezel with a 60-minute scale, which is what a dive watch needs.

What affects the value of a HydroConquest?

The version (quartz, automatic, chronograph, GMT, ceramic), condition, service history and whether box and papers are included.

Find out what your watch is worth

Upload a photo and get a free estimate in about a minute. No sign-up needed.

Start free estimate →