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The Hamilton Khaki Navy BeLOWZERO Auto Titanium H78505330 is a 46 mm black-PVD titanium dive watch with a stated 1,000 m water-resistance rating and Hamilton’s automatic H-10 movement. Its size is the main fit question: the case is 15.7 mm thick, and Fratello reports a 55 mm lug-to-lug length. One reviewer found it too large on an 18.5 cm wrist, a useful data point but not a universal cutoff.
What is the H78505330?
H78505330 is the black-dial, black-PVD titanium version of Hamilton’s Khaki Navy BeLOWZERO Auto Titanium. Its subdued finish gives the oversized case a notably dark, stealth-oriented look. Hamilton specifies a 46 mm case, 15.7 mm thickness, sapphire crystal with anti-reflective treatment, and 24 mm lug width. Hamilton’s US product page is the primary reference for the model’s current specifications.
The case dimensions deserve attention together rather than in isolation: 46 mm describes the width, while 15.7 mm is substantial height. Fratello’s hands-on account gives the additional fit dimension of 55 mm lug-to-lug and reports a weight of 129 g. Those measurements suggest a watch with a broad footprint, even though titanium keeps its weight down for its size.
How does it wear?
Fit will depend on wrist shape, how a watch sits, and personal preference, so a diameter alone cannot determine whether it will work for you. The 55 mm lug-to-lug measurement is particularly worth comparing with a watch you already wear comfortably; the case is also 15.7 mm thick, so it will sit high as well as span a wide area.
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- AUTOMATIC MOVEMENT: Swiss H-10 movement with 80-hour reserve ensures consistent performance. Experience precision that matches both daily tasks and adventures, a testament to Swiss craftsmanship in automatic timekeeping.
- WATER RESISTANT TO 100M: Withstands 10 bar (100 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- MADE FOR THE DEEP: Designed with a 40mm stainless steel case and a striking black dial, this watch is water-resistant up to 100m, making it perfect for underwater exploration. Sapphire crystal ensures excellent visibility in any marine environment.
- PREMIUM MATERIALS: Stainless steel bracelet with folding clasp offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
In a July 22, 2024 hands-on article, Fratello’s Lex Stolk reported that the 129 g watch was too large for his 18.5 cm wrist. His verdict reflects his own wrist and taste, not a minimum wrist-size rule. As he put it, “It’s light for its size. Let’s leave it at that.” Stolk’s full wear report offers a personal perspective rather than a fit guarantee for other owners.
For a practical check, compare the watch’s 55 mm lug-to-lug span with a familiar watch, and consider whether you are comfortable with 15.7 mm of height. If possible, try this exact reference on: dimensions are a screening tool, not a substitute for seeing how the case and strap sit on your wrist.
Rank #2
- AUTOMATIC MOVEMENT: Swiss H-10 movement with 80-hour reserve ensures consistent performance. Experience precision that matches both daily tasks and adventures, a testament to Swiss craftsmanship in automatic timekeeping.
- WATER RESISTANT TO 100M: Withstands 10 bar (100 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- MADE FOR THE DEEP: Designed with a 40mm stainless steel case and a striking blue dial, this watch is water-resistant up to 100m, making it perfect for underwater exploration. Sapphire crystal ensures excellent visibility in any marine environment.
- PREMIUM MATERIALS: Stainless steel bracelet with folding clasp offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
What are the movement and dive-watch specifications?
H-10 automatic movement
Hamilton lists its automatic H-10 caliber with an 80-hour power reserve and a Nivachron balance spring. The reserve indicates the stated running time when the watch is fully wound and then left unworn; it is not a guarantee of accuracy or a substitute for the manufacturer’s operating and service guidance.
Water resistance and construction
Hamilton specifies water resistance of 100 bar (1,000 m), a screw-down crown, and a helium escape valve. These are manufacturer specifications, not independent test results. A high stated rating does not by itself establish that a particular watch is suitable for a given dive or that an older watch remains water-resistant; condition, maintenance, and correct handling matter. Consult Hamilton’s guidance and have water resistance checked when appropriate before exposing the watch to water.
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- AUTOMATIC MOVEMENT: Swiss H-10 movement with 80-hour reserve ensures consistent performance. Experience precision that matches both daily tasks and adventures, a testament to Swiss craftsmanship in automatic timekeeping.
- WATER RESISTANT TO 300M: Withstands 30 bar (300 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- MADE FOR THE DEEP: Designed with a 43mm stainless steel case and a striking silver dial, this watch is water-resistant up to 300m, making it perfect for underwater exploration. Sapphire crystal ensures excellent visibility in any marine environment.
- PREMIUM MATERIALS: Stainless steel bracelet with folding clasp offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
What should you know about the strap?
The H78505330 is supplied with a black rubber strap, and Hamilton lists a 24 mm lug width and strap reference H6007851111. Width is only one part of compatibility: check the attachment, taper, buckle, and fit of any replacement strap rather than assuming every 24 mm strap will work. Hamilton lists the strap information on its H78505330 product page.
How does it differ from the gray-and-yellow version?
Hamilton also lists H78535380, a distinct titanium BeLOWZERO variant with a gray dial and yellow rubber strap. It shares the listed 46 mm case, 15.7 mm thickness, 55 mm lug-to-lug length, 24 mm lug width, H-10 movement, 80-hour reserve, and 1,000 m rating. The references are not interchangeable: H78505330 is the black-dial, black-PVD model, while H78535380 is the gray-and-yellow colorway. Hamilton’s H78535380 page identifies that separate version.
Rank #4
- AUTOMATIC MOVEMENT: Swiss H-14 movement with 80-hour reserve ensures consistent performance. Experience precision that matches both daily tasks and adventures, a testament to Swiss craftsmanship in automatic timekeeping.
- WATER RESISTANT TO 300M: Withstands 30 bar (300 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- MADE FOR THE DEEP: Designed with a 43mm Stainless Steel case and a striking white dial, this watch is water-resistant up to 300m, making it perfect for underwater exploration. Sapphire crystal ensures excellent visibility in any marine environment.
- PREMIUM MATERIALS: Stainless steel bracelet with folding clasp offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
Fratello’s hands-on article discusses a gray-and-yellow version and calls out visual details including yellow lume. Do not assume those color-specific observations apply to the black-dial H78505330; check the precise reference when comparing appearance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Price and availability
Hamilton’s US product page listed the H78505330 at $2,175 and in stock on October 8, 2026. That is a dated US listing, not a guaranteed current price or availability; check Hamilton’s page for the latest status before buying.
Quick Recap
Best Value
- AUTOMATIC MOVEMENT: Swiss H-10 movement with 80-hour reserve ensures consistent performance. Experience precision that matches both daily tasks and adventures, a testament to Swiss craftsmanship in automatic timekeeping.
- WATER RESISTANT TO 100M: Withstands 10 bar (100 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- MADE FOR THE DEEP: Designed with a 40mm stainless steel case and a striking black dial, this watch is water-resistant up to 100m, making it perfect for underwater exploration. Sapphire crystal ensures excellent visibility in any marine environment.
- PREMIUM MATERIALS: Stainless steel bracelet with folding clasp offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
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.
