Longines · Family: HydroConquest
The Longines HydroConquest L3.788.4.56.6 is the 2026 generation of Longines's dive watch, with a 42mm steel case, ceramic bezel, and black lacquered dial, updating the model originally launched in 2007. It runs the automatic manufacture caliber L888.5 (ETA 2892 base) with a silicon hairspring and 72 hours of power reserve. Cazador has no verified price observations (n=0) for this reference as of today.
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Longines introduced the HydroConquest in 2007 as its modern dive-watch proposal, aesthetically derived from the Conquest line — registered as a collection in 1954 — but with a unidirectional bezel graduated to 60 minutes and a more pronounced tool-watch vocation, meant as a contemporary alternative to heritage models like the Legend Diver, already in Cazador's catalog.
In 2026, Longines unveiled a full overhaul of the collection: a redesigned case in two sizes (39 and 42mm), a ceramic bezel available in five colors, a less prominent crown guard, and, for the first time in the line, an H-link bracelet inherited from the HydroConquest GMT, with a tool-less micro-adjust system.
The L3.788.4.56.6 runs the L888.5 caliber, an automatic movement based on the ETA 2892 built exclusively for Longines, with a silicon hairspring resistant to magnetic fields and 72 hours of power reserve, an improvement over earlier HydroConquest generations. It retains the 300 meters of water resistance that has characterized the line since 2007. [UNVERIFIED: we do not confirm the exact in-store availability date for this specific reference within the 2026 refresh, beyond its public unveiling].
Cazador has no verified price observations for this reference (0 PricePoints recorded as of July 2026). We do not publish estimates without our own sourced market data.
A redesigned case in 39mm and 42mm, a ceramic bezel in five colors, a less prominent crown guard, and a new H-link bracelet with tool-less micro-adjust.
In 2007, as Longines's tool dive-watch proposal, derived from the 1954 Conquest line.
The L888.5, an automatic movement based on the ETA 2892 built exclusively for Longines, with a silicon hairspring and 72 hours of power reserve.
Yes, up to 300 meters (30 bar), water resistance befitting a tool dive watch.
The Legend Diver is a faithful reissue of a 1960s model; the HydroConquest is the brand's contemporary dive proposal, with design and materials updated in 2026.