The green 41 mm Longines HydroConquest is reference L3.781.4.06.6. Longines lists its dial color as “Green matt,” rather than khaki green. It is an automatic stainless-steel watch with a ceramic bezel, up to 72 hours of power reserve and a manufacturer-stated water resistance of 30 bar (300 m).
What is the reference number for the green 41 mm HydroConquest?
The reference is L3.781.4.06.6. Longines identifies this version as a 41.00 mm HydroConquest automatic with a “Green matt” dial. “Khaki green” describes the color in the title, not the manufacturer’s official dial-color label. The green 43 mm automatic is a separate model, reference L3.782.4.06.6.
What are the Longines HydroConquest 41 mm specifications?
| Specification | Longines listing |
|---|---|
| Reference | L3.781.4.06.6 |
| Case diameter | 41.00 mm |
| Case and bezel | Stainless-steel case; ceramic bezel |
| Movement | Self-winding mechanical; 25,200 vibrations per hour |
| Power reserve | Up to 72 hours |
| Functions | Date |
| Water resistance | 30 bar (300 m), as stated by Longines |
| Crystal | Scratch-resistant sapphire with several layers of anti-reflective coating on both sides |
| Dial | Green matt with Swiss Super-LumiNova |
| Bracelet and clasp | Stainless-steel bracelet; double-safety folding clasp |
Longines also lists a screw-in crown and unidirectional rotating bezel for this reference. The collection page describes the HydroConquest family as including automatic and quartz models, with water resistance up to 30 bar (300 m), a unidirectional bezel, screw-in crown and screw-down case back; those family-level details should not be taken to mean every variation has identical specifications. See the Longines US product page for the reference’s current listing.
What do 30 bar (300 m) and up to 72 hours mean?
Water resistance
Longines states water resistance of 30 bar (300 m). Its manual explains that the bar-to-metre equivalence reflects overpressure values under standard ISO 22810. This is the manufacturer’s rating, not evidence of an independent dive test or a guarantee that the watch is suitable for every type of diving. Longines recommends an annual water-resistance check by an approved service centre and warns against operating the crown underwater.
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Power reserve
Longines specifies an up to 72-hour power reserve for the self-winding movement. The figure is the manufacturer’s published maximum, not an accuracy or endurance test of an individual watch.
How much does the green HydroConquest 41 mm cost?
When accessed in 2026, Longines’ US product page displayed $2,000, while its global page displayed CHF 1,700. These are region-specific displayed prices, not interchangeable global pricing or a guarantee of the amount payable. Check local price, taxes, availability and seller before buying; prices and stock can change. The Longines global product page shows the global listing.
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How does the 41 mm green model differ from the 43 mm?
The 41 mm model discussed here is reference L3.781.4.06.6; the green 43 mm automatic is reference L3.782.4.06.6. The confirmed distinction is the reference and case diameter. Do not assume the two references have identical specifications or pricing: check the individual manufacturer listing for the exact model before comparing.
What should you check when comparing HydroConquest variations?
Longines’ US listing also shows 41 mm variations with black, grey and blue dials, as well as rubber-strap options. Their appearance in the variation display does not establish identical specifications or prices. Compare the details for the exact reference:
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- Reference number and case diameter
- Dial color and finish
- Bracelet or rubber strap
- Movement type and stated power reserve
- Water-resistance specification
- Local price, seller and warranty documentation
Does the Longines warranty cover a used HydroConquest?
Longines’ international warranty document states that qualifying mechanical watches purchased from January 1, 2021 receive a five-year warranty under its conditions. Coverage takes effect only when the warranty certificate is dated and fully completed by an official Longines dealer. The document does not establish that every second-hand watch has full coverage; check the original purchase date, certificate and remaining eligibility with Longines or an authorized dealer.
The same document gives straps and bracelets a 24-month international warranty against material or manufacturing defects. It also recommends rinsing the watch after contact with seawater. Consult the Longines international warranty document for the applicable terms.
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