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The Jaeger-LeCoultre Master Compressor Diving Chronograph GMT Navy SEALs Q178T677 is a limited-edition titanium diver combining an automatic chronograph with a second time zone, date and day/night indication. Auction records identify 46 mm examples from around 2010; specialist listings give the titanium model a 1,000-meter water-resistance rating. For a pre-owned watch, that published rating is not proof that the individual watch is still safe to use in water.
What is the Q178T677?
Q178T677 identifies the titanium version of Jaeger-LeCoultre’s Master Compressor Diving Chronograph GMT Navy SEALs. Sotheby’s catalogued a circa-2010 example as a limited-edition dual-time-zone chronograph with date and day/night indication. Its example was numbered 208 of 1,500, measured 46 mm in diameter and came on a black Jaeger-LeCoultre rubber bracelet with a double folding clasp. Sotheby’s catalogue
Bonhams later catalogued another example, numbered 629/1,500, as a titanium dual-time calendar chronograph diver. Its April 2011 sale record provides additional movement details. Bonhams catalogue
The watch has a large titanium case, black dial and chronograph registers. Those documented details establish its instrument-like design, but case diameter alone cannot tell you how it will fit your wrist.
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- 【Premium Automatic GMT Watch】Built around the reliable NH34 self-winding mechanical movement, this 43mm dive watch features an independent 24-hour GMT hand for dual-timezone tracking, 41-hour power reserve, and daily accuracy of -20 to +40 seconds. The dial is finished with a striking sunburst texture and a 3D logo at the 12 o'clock position, elevating the luxury feel.
- 【300M Professional Dive-Ready Build】Crafted from corrosion-resistant 316L stainless steel, this watch is built for underwater performance. It features a scratch-resistant unidirectional rotating ceramic bezel, a screw-down crown, and a screw-on exhibition caseback with sapphire crystal. With a 30ATM water resistance rating, it stands up to swimming, snorkeling, and professional diving activities.
- 【High-Visibility BGW9 Super Luminous】Legibility is key in low-light conditions. The hands, hour markers, and bezel are all infused with Swiss-grade BGW9 Super-LumiNova (not just coated), emitting a bright, pure blue glow after brief light exposure. This ensures over 90% night-time readability, so you can check the time clearly even in complete darkness.
- 【Durable & Versatile Construction】The watch is protected by a domed sapphire crystal with excellent clarity and wear resistance. The bracelet is made of solid 316L stainless steel, fitted with a secure dual-push dive extension clasp for a comfortable fit over wetsuits (3-7mm thick). It also includes a quick-release premium silicone strap for easy swaps between sporty and casual looks.
- 【Complete After-Sales & Gift Package】Each watch comes in a premium TOPHILL gift box, including the dive extension clasp, spring bar tool, and a watch cloth. We stand behind our product with a 30-day no-reason return policy and a 2-year warranty, ensuring you can shop with confidence.
Movement and functions
The automatic Jaeger-LeCoultre caliber 757 powers the chronograph and second-time-zone display. The model’s documented indications also include a date and day/night display, making the GMT function useful for distinguishing whether it is day or night in the second time zone. Sotheby’s identifies the complications; Bonhams lists a 45-jewel caliber 757 and a 65-hour power reserve. The jewel count and reserve are auction-catalogue specifications, not figures confirmed here against a current manufacturer technical sheet. Sotheby’s catalogue · Bonhams catalogue
Water resistance: what the 1,000-meter rating does—and does not—mean
Specialist listings report 1,000 meters of water resistance for the titanium Q178T677. Jackroad also lists a Grade 5 titanium case and ceramic bezel. These are published model specifications; they do not establish the pressure integrity of a particular pre-owned watch. Jackroad’s Q178T677 listing
Rank #2
- Premium Craftsmanship – This men's watch features a robust 44mm 316L stainless steel octagonal case, offering a distinctive and durable design. The sapphire lens with anti-reflective coating ensures clarity and scratch resistance, making it suitable for both adventure and daily wear.
- Precision Engineering – Equipped with the Seiko NH34 GMT automatic movement, this timepiece allows tracking of multiple time zones with accuracy. The independent GMT hand and bi-directional 24-hour bezel facilitate seamless timekeeping for the modern traveler.
- Ready for Adventure – With a water resistance of up to 300 meters (30 ATM), this watch is built to withstand deep-sea explorations and rigorous activities. The screw-down crown and exhibition case back enhance its resilience and functionality under pressure.
- Comfortable Wear – The solid stainless steel bracelet, complemented by an additional matching rubber strap, offers versatility and comfort. The fold-over buckle with safety lock and push button ensures a secure fit for any occasion.
- Inspired by the Depths – Paying homage to pioneering diver Frédéric Dumas, this timepiece combines vintage diving aesthetics with modern functionality. Spinnaker's dedication to maritime heritage is evident in the Dumas GMT, making it an ideal companion for those drawn to the sea's allure.
Before swimming or diving with an older example, ask a qualified watchmaker for a recent pressure-test result and relevant service documentation. If the seller cannot provide those records, treat the watch’s present water resistance as unverified.
How the Navy SEALs variants differ
“Navy SEALs” appears across multiple Master Compressor Diving models, so the name alone is not enough to identify the watch or transfer specifications between versions.
Rank #3
- JAPANESE AUTOMATIC MOVEMENT FOR MECHANICAL PRECISION - Self-winding technology for dependable performance.
- SAPPHIRE CRYSTAL AND STAINLESS STEEL DIVE CONSTRUCTION - Premium durability and clarity.
- ROTATING GMT BEZEL FOR TRAVEL AND EXPLORATION - Dual-time functionality with diver styling.
- PROFESSIONAL PERFORMANCE WITH EVERYDAY VERSATILITY - Ideal for travel, diving and daily wear.
| Model or reference | Material and size | Movement and functions | Published water resistance | Edition |
|---|---|---|---|---|
| Q178T677 titanium GMT chronograph | Titanium; 46 mm in Sotheby’s catalogue | Automatic caliber 757; chronograph, second time zone, date and day/night indication | 1,000 m, reported by Jackroad and My-Watchsite | 1,500 pieces, reported by Jackroad and My-Watchsite; Sotheby’s and Bonhams examples are numbered 208/1,500 and 629/1,500 |
| Pink-gold GMT chronograph variant | Pink gold; size not stated by My-Watchsite | Not stated by My-Watchsite | 300 m, reported by My-Watchsite | 500 pieces, reported by My-Watchsite |
| Steel Master Compressor Diving Navy Seals, reference 2018670 | Steel; 42 mm in TheWatchObserver’s 2010 review | Caliber 899; time display, with a 43-hour reserve reported in that review | Not stated in TheWatchObserver’s cited review | Not stated in TheWatchObserver’s cited review |
The titanium and pink-gold ratings and edition counts are variant-specific figures reported by My-Watchsite; Jackroad also lists the titanium edition at 1,500 pieces. My-Watchsite model-family listing Jackroad’s Q178T677 listing
The steel 2018670 is a different, simpler watch—not another name for the Q178T677. TheWatchObserver’s June 9, 2010 review gives that steel model a 42 mm case, caliber 899, 43-hour reserve and a French recommended price of €6,250 at the time. Those historical specifications and price do not apply to the titanium GMT chronograph, whose launch price is not established here. TheWatchObserver’s 2010 review
Rank #4
- Premium Craftsmanship – This men's watch features a robust 44mm 316L stainless steel octagonal case, offering a distinctive and durable design. The sapphire lens with anti-reflective coating ensures clarity and scratch resistance, making it suitable for both adventure and daily wear.
- Precision Engineering – Equipped with the Seiko NH34 GMT automatic movement, this timepiece allows tracking of multiple time zones with accuracy. The independent GMT hand and bi-directional 24-hour bezel facilitate seamless timekeeping for the modern traveler.
- Ready for Adventure – With a water resistance of up to 300 meters (30 ATM), this watch is built to withstand deep-sea explorations and rigorous activities. The screw-down crown and exhibition case back enhance its resilience and functionality under pressure.
- Comfortable Wear – The solid stainless steel bracelet, complemented by an additional matching rubber strap, offers versatility and comfort. The fold-over buckle with safety lock and push button ensures a secure fit for any occasion.
- Inspired by the Depths – Paying homage to pioneering diver Frédéric Dumas, this timepiece combines vintage diving aesthetics with modern functionality. Spinnaker's dedication to maritime heritage is evident in the Dumas GMT, making it an ideal companion for those drawn to the sea's allure.
For period context, Fratello’s 2009 SIHH report names the Diving Alarm, Diving Chronograph GMT and Diving Pro Geographic Navy SEALs models, and describes Grade 5 titanium cases and 1,000-meter water resistance in the collection it covered. Use that collection-level account as context rather than as a substitute for reference-specific specifications. Fratello’s SIHH 2009 report
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to check before buying a pre-owned Q178T677
Assess the specific watch, not just the model’s reputation or a seller’s description. Before committing, ask for:
Best Value
- JAPANESE AUTOMATIC MOVEMENT FOR MECHANICAL PRECISION - Self-winding technology for dependable performance.
- SAPPHIRE CRYSTAL AND STAINLESS STEEL DIVE CONSTRUCTION - Premium durability and clarity.
- ROTATING GMT BEZEL FOR TRAVEL AND EXPLORATION - Dual-time functionality with diver styling.
- PROFESSIONAL PERFORMANCE WITH EVERYDAY VERSATILITY - Ideal for travel, diving and daily wear.
- Clear photographs of the reference and serial markings, plus confirmation of the numbered edition.
- Movement and service paperwork that can be matched to the watch.
- A recent pressure-test result from a qualified watchmaker if water use matters.
- Details and photographs of the bracelet or strap, clasp, and included original accessories.
- Condition and provenance information, with any seller claims distinguished from independent inspection.
Compare asking prices only against examples with comparable condition, documentation, completeness and provenance. A current market valuation is not established here, and an auction or retailer record should not be treated as a live price guide.
Quick Recap
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.
