The closest match is the Longines HydroConquest reference L3.788.4.56.6: a 42 mm, black-dial automatic watch. Longines lists it on a stainless-steel bracelet, not a brown leather strap, and the available product information does not confirm which leather strap would fit. Treat the brown-strap look as a styling idea, not as a verified factory configuration.
Which 42 mm black HydroConquest is it?
Longines identifies reference L3.788.4.56.6 as a 42.00 mm automatic HydroConquest with a black lacquered, polished dial. Its official listing describes a stainless-steel case and ceramic bezel. Longines product listing
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The listing specifies a date, Swiss Super-LumiNova, and a self-winding mechanical movement operating at 25,200 vibrations per hour, with a power reserve of up to 72 hours. It also lists a screw-in crown, a unidirectional rotating bezel, water resistance to 30 bar, and scratch-resistant sapphire crystal with anti-reflective coating on both sides. The supplied bracelet is stainless steel, with a double-security folding clasp and micro-adjustment system. Longines product listing
Does reference L3.788.4.56.6 come on a brown leather strap?
No—not in Longines’ listed configuration. The official page shows a stainless-steel bracelet. It does not establish that a factory brown leather option is available for this reference. Longines product listing
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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A brown strap may be a styling direction, but do not assume that a strap fits based on the 42 mm case size alone. The available product details do not establish the exact lug width or attachment geometry, or verify the fit of an aftermarket strap. Confirm compatibility for reference L3.788.4.56.6 with Longines or a qualified watch specialist before buying or recommending a replacement.
How is the 42 mm model different from the 41 mm black HydroConquest?
Longines also lists the black-dial HydroConquest reference L3.742.4.56.6 at 41 mm, with a stainless-steel bracelet. It is a separate reference, not another name for the 42 mm L3.788.4.56.6. Check the reference as well as the case size when identifying the watch or asking about strap fit. Longines product listing for L3.742.4.56.6
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
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Rank #4
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Rank #2
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What to verify before buying
- Reference: Look for L3.788.4.56.6 if you mean the 42 mm black-dial automatic.
- Included configuration: Longines lists a stainless-steel bracelet, not brown leather.
- Strap fit: Get confirmation for the exact reference; the case diameter does not determine compatibility.
- Price and stock: Longines’ US listing displayed $2,400 and a “Notify me when available” option when accessed. Price and availability vary by market and can change, so check the official page for current details. That listing does not verify availability through another retailer. Longines product listing
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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