Water & Dive
Purposeful watches with strong legibility and model-specific water resistance, including the famous Navy SEAL families.
Marcus Tempus
Product Story
Created in partnership with the Navy SEAL Foundation, the Luminox Back To The Blue celebrates the return of Navy SEAL operations to their aquatic origins following two decades in which land and desert missions played a dominant role.
Its distinctive colour palette sets it apart immediately. A deep shadow-blue bezel and matching blue rubber strap are paired with a black dial and warm gold detailing, creating a military watch that retains Luminox's unmistakably rugged character while feeling considerably more distinctive on the wrist.
The substantial 45mm IP-black 316L stainless-steel case is fitted with a blue fibreglass-compound unidirectional bezel, sapphire crystal with anti-reflective coating and a protected screw-down crown. Water resistance to 200 metres makes it a genuinely capable dive-inspired sports watch. The Navy SEAL Foundation logo is engraved on the screw-down case back.
Inside is the Swiss Ronda 715 quartz movement, offering time and date functions and a stated battery life of approximately 72 months. Luminox Light Technology uses 16 illumination tubes to provide a constant self-powered glow for up to 25 years without requiring external charging.
Features
Model: XS.3255.CB.NSF
Collection: Navy SEAL Foundation – Back To The Blue
Series: 3250
Swiss Made
Movement: Swiss quartz
Calibre: Ronda 715
Functions: Time & date
Battery Life: Approx. 72 months
Case: IP-black 316L stainless steel
Case Diameter: 45mm
Case Height: 14mm
Bezel: Blue fibreglass compound, unidirectional rotating
Crystal: Sapphire crystal with anti-reflective coating
Crown: Protected screw-down crown
Case Back: Screw-down 316L stainless steel with Navy SEAL Foundation engraving
Water Resistance: 200m / 660ft / 20 ATM
Illumination: Luminox Light Technology
Visibility: Constant glow for up to 25 years
Strap: Blue nitrile rubber
Lug Width: 24mm
Buckle: CARBONOX™
Weight: 105g
Marcus Tempus Brand Passport
MT-BP-002
Swiss Performance Watches
Luminox
Brand Passport • Swiss Made • Since 1989Founded1989
WatchmakingSwiss Made
Signature TechnologyLuminox Light Technology
IlluminationSelf-powered for up to 25 years
Performance HeritageNavy SEAL collaboration
Design WorldSea • Air • Land
Performance on the Wrist
Made to Be Read at a Glance
Luminox watches combine strong dial contrast, practical case construction and highly visible markers with a distinctly purposeful design language.
The result is a watch that feels equally at home outdoors, on the water or in everyday life — with the visual character to remain unmistakably Luminox.
The Technology
Luminox Light Technology
Luminox Light Technology uses tiny borosilicate glass capsules containing micro gas lights on the hands, hour markers and, on selected models, the bezel.
Unlike conventional luminous paint that must first absorb light, LLT is self-powered and designed to provide continuous visibility for up to 25 years.
24/7
Visibility without external charging
A Defining Chapter
The Navy SEAL Connection
In 1992, Navy SEAL research and development officer Chief Nick North worked with Luminox to develop a watch suited to the demanding needs of the SEALs.
That collaboration helped establish the Original Navy SEAL 3000 Series and became one of the most recognisable parts of the Luminox story.
Purposeful Materials
CARBONOX™
CARBONOX™ is Luminox's carbon-based case material, developed for watches where low weight and robust construction matter.
Luminox describes CARBONOX™ as six times lighter than steel and three times lighter than titanium, while also being non-metallic, anti-magnetic and resistant to changing weather conditions.
The Luminox World
Sea. Air. Land.
Aviation Influence
Watches inspired by cockpit clarity, technical readability and the practical requirements of aviation.
Outdoor Performance
Rugged watches designed for everyday adventure, field use and reliable visibility beyond the city.
Choosing Your Watch
Specifications Vary by Model
Luminox collections include different case materials, movements, crystals, case sizes and levels of water resistance. Some models use quartz movements while others are automatic.
We therefore list the exact technical specification on each Marcus Tempus product page rather than applying one specification to the whole brand.
Care & Water Resistance
Keeping a Luminox Ready for Use
Water resistance is not permanent. Luminox recommends that gaskets are inspected and replaced every 18–24 months, or more frequently when a watch is regularly exposed to chlorinated pools or salt water. The exact water-resistance rating should always be checked on the individual model.
Luminox Questions
Frequently Asked Questions
What is Luminox Light Technology?
It is a self-powered illumination system using micro gas lights inside tiny glass capsules to provide continuous low-light visibility.
How long does LLT last?
Luminox states that its self-powered illumination is designed to remain visible for up to 25 years.
Do Luminox watches need light to charge?
No. LLT does not rely on external light to charge in the way conventional luminous paint does.
What is CARBONOX™?
It is a lightweight carbon-based material used by Luminox on selected watch cases and components.
Are all Luminox watches waterproof to the same depth?
No. Water resistance varies by model, so the individual watch specification should always be checked.
Are all Luminox watches quartz?
No. The range includes quartz watches as well as selected automatic models.
Explore Luminox
Discover the Collection
Explore our current Luminox watches online, or visit Marcus Tempus to see selected models in person.