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The Longines HydroConquest L3.781.4.05.6 combines technical excellence with modern sports performance. Housed in a 41.00 mm stainless steel case with a ceramic bezel, it features a striking black dial with Swiss Super-LumiNova for optimal legibility.
Powered by a self-winding mechanical movement beating at 25,200 vibrations per hour, this automatic watch delivers a reliable power reserve of up to 72 hours alongside a convenient date display.
Built for aquatic exploration, it offers 30 bar water resistance, a screw-in crown, a unidirectional rotating bezel, and a durable stainless steel bracelet with a double safety folding clasp.
Key Features
| Brand | Longines |
| Collection | HydroConquest |
| Model Number | L3.781.4.05.6 |
| Movement Type | Automatic (Self-winding mechanical) |
| Power Reserve | 72 hours |
| Frequency | 25,200 vph |
| Case Diameter | 41 mm |
| Case Material | Stainless steel and ceramic bezel |
| Bezel | Unidirectional rotating bezel |
| Crown | Screw-in crown |
| Crystal | Scratch-resistant sapphire crystal with anti-reflective coating on both sides |
| Water Resistance | 30 bar (300 m) |
| Dial Color | Black |
| Luminescence | Swiss Super-LumiNova |
| Functions | Date, hours, minutes, seconds |
| Bracelet Material | Stainless steel |
| Clasp Type | Double safety folding clasp |
Highlights
- Swiss automatic self-winding movement with up to 72 hours of power reserve
- Durable stainless steel 41 mm case with a scratch-resistant black ceramic bezel
- Scratch-resistant sapphire crystal with anti-reflective coating on both sides
- Water-resistant up to 30 bar (300 m) with a secure screw-in crown
- Black dial with high-contrast Swiss Super-LumiNova luminescence and date display
- Stainless steel bracelet equipped with a double safety folding clasp
Frequently asked questions
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PAYMENT METHODS

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SHIPPING & RETURNS
DELIVERY
- We aim to dispatch all in-stock items from our warehouse within 2-5 business days. An email will be sent to you which will include all your tracking information once your order has been handed over to our courier partner.
- If an item is out of stock, we will email you as soon as possible to arrange a full refund or exchange.
- FREE shipping for all orders to any South African address.
- International delivery to Zimbabwe, Namibia and Botswana is available for some brands. Please contact us for a shipping quote.
- Easy 7 days returns and exchanges
RETURNS
If you do not like the product you can return it within 7 days, assuming the item is not worn, scratched or damaged in any way, and includes all the original packaging.
Please contact us for any returns or exchanges
WATER RESISTANCE
Please check the marking on the back of your watch case and refer to the following table to confirm the degree of water resistance of your watch and the preferable conditions of use. A watch’s water resistance is not permanently guaranteed. It is affected by the ageing of gaskets or deformation of watch parts due to accidental shock. To preserve a watch’s water resistance as long as possible, please follow the precautions below:
- Wipe off moisture, sweat or dirt with a soft dry cloth after removing it from the wrist in order to increase the durability of the case back, gaskets and band.
- After using a water resistant watch in ocean water, wash it in fresh water and dry it with a soft cloth.
- Do not wash a water resistant watch while the crown is pulled out.
- Do not operate the crown or press a button when the watch is wet.
- A periodic overhaul service is recommended to check the water resistance of the watch regularly to ensure it’s functionality.
〇:OK, ✕:Not OK
Type of water resistance | For saturation diving | For scuba diving | Enhanced water resistance for | Water resistance for | Non-water resistance | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Water resistance | Professional Diver's Watch | Diver's watch | 20 | 10 | 5 | 3 | ||||||||
Usage example | Accidental splashes and Contact with rain | 〇 | 〇 | 〇 | 〇 | 〇 | 〇 | × | ||||||
Swimming, Yachting, | 〇 | 〇 | 〇 | 〇 | 〇 | × | × | |||||||
Skin diving | 〇 | 〇 | 〇 | 〇 | × | × | × | |||||||
Scuba diving | 〇 | 〇 | × | × | × | × | × | |||||||
Saturation Diving | 〇 | × | × | × | × | × | × | |||||||
REVIEWS
Longines HydroConquest Automatic Watch L3.781.4.05.6
WHY BUY FROM US?
- AUTHORISED ONLINE DEALERThe Watch Boutique is an authorised online stockist for all brands. This includes a full international warranty.
- FREE AND FAST DELIVERYShipping is free for all orders in South Africa. We dispatch all orders within 2-5 business days.
- SECURE PAYMENT OPTIONSIncluding Buy Now, Pay Later plans with PayFlex and Pay Just Now.
- AFTER-SALES SERVICEWe have a full on-site watch repair workshop to take care of all after-sales needs.
