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Choose the Vulcain Skindiver Nautique GMT if you want a notably more compact 38.3 mm watch; choose the Longines HydroConquest GMT if you prefer a 41 or 43 mm case, a higher published water-resistance rating, a unidirectional bezel, or a longer stated power reserve. Neither is the universal winner: your preferred fit, intended use, exact version, and local price should decide.
At a glance: the main differences
| Specification | Vulcain Skindiver Nautique GMT | Longines HydroConquest GMT |
|---|---|---|
| Case size | 38.3 mm diameter; 12.2 mm thick | 41 mm or 43 mm, depending on the cited version |
| Published water resistance | 200 m / 20 ATM | 300 m / 30 bar |
| Bezel | Bidirectional ceramic | Unidirectional rotating ceramic |
| Movement | Automatic Soprod C125 GMT | Longines caliber L844; silicon balance-spring stated |
| Power reserve | 42 hours | Up to 72 hours |
| Price examples in cited listings | CHF 1,970 for a blue limited edition; CHF 2,150 on the black/white-lume page; collection entry prices from CHF 1,890 | US examples: $3,350 on steel bracelet; $3,150 on rubber |
Specifications and listed prices are from the manufacturers’ cited product pages, accessed October 12, 2026: Vulcain, Longines 41 mm, and Longines 43 mm. The price examples cover different currencies and markets, and are not directly comparable street prices.
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Which one wears smaller?
The Vulcain is the clear choice on stated diameter: its case measures 38.3 mm across and 12.2 mm thick. The cited HydroConquest GMT options are 41 mm and 43 mm, a meaningful difference if you prefer a more compact watch or find larger cases dominate your wrist.
Diameter alone does not establish how a watch will fit. The available specifications do not provide a like-for-like lug-to-lug comparison or comparative wrist testing, so try the exact size on if possible. The two Longines sizes also give you a choice within that family; Vulcain’s cited GMT is the smaller proposition.
#1 Best Overall
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How do their dive-watch specifications compare?
Water resistance
Vulcain publishes 200 m (20 ATM) water resistance, while Longines publishes 300 m (30 bar) for the cited HydroConquest GMT versions. Those are manufacturer specifications, not a guarantee that either watch suits every kind of diving. Check the watch’s instructions and match the rating to your intended use; a depth rating alone does not establish professional certification.
Bezels
Vulcain specifies a bidirectional ceramic bezel. Longines specifies a unidirectional rotating ceramic bezel. If you want a dive-style bezel that turns in only one direction, the Longines matches that preference; the Vulcain’s stated bezel rotates both ways.
Rank #2
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What do you get from each GMT movement?
Vulcain Soprod C125
Vulcain lists an automatic Soprod C125 GMT movement with a 42-hour power reserve. The brand says its 24-hour hand can be set independently, a useful feature for tracking another time zone while traveling. Vulcain describes this as allowing “easy independent setting of the 24-hour hand.”
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Longines lists its L844 caliber, a silicon balance-spring, and a power reserve of up to 72 hours. That is a longer stated reserve than Vulcain’s 42 hours. The cited Longines product page confirms GMT/date functionality, but does not establish the exact hand-setting procedure; consult the manual for operating instructions.
Rank #3
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How should price and configuration affect the choice?
The cited Vulcain pages show CHF prices: CHF 1,970 for a blue limited edition, CHF 2,150 on the black/white-lume listing, and collection entry prices from CHF 1,890. The cited Longines US examples list $3,350 for steel-bracelet versions and $3,150 for rubber versions. These figures differ by currency, geography, and configuration, so they do not establish a like-for-like price gap. Confirm the price for the exact reference in your market, including taxes, bracelet or strap, and any discount.
Vulcain’s collection lists dedicated straps and a 38.3 mm bracelet for the Skindiver Nautique GMT. The cited information does not establish comparable replacement-accessory options for Longines.
Rank #4
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Which should you choose?
Choose the Vulcain if
- You want the smaller stated case diameter: 38.3 mm.
- You prefer its vintage-inspired styling and a 200 m published rating meets your requirements.
- You value the manufacturer’s stated independent setting of the 24-hour hand.
- You want the listed model-specific strap and bracelet options.
Choose the Longines if
- You prefer a 41 mm or 43 mm case.
- You prioritize its higher published water-resistance rating or unidirectional ceramic bezel.
- You want the longer stated power reserve, up to 72 hours, or a silicon balance-spring.
Before buying, compare the exact references available where you live and try the case size if you can. The choice comes down less to a single “better” specification than to whether compact dimensions or the Longines’ stated dive-watch and movement features matter more to you.
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Best Value
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- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
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.
