The ProTek PT1013B is a 45mm USMC-branded dive watch built around forged carbon composite, T25 tritium illumination, a sapphire crystal and 300-meter water resistance. Its most unusual characteristic is the combination of a large case with a listed weight of only 73.2 grams. I have not owned this model, so this review focuses on its documented specifications, design and the features that make it interesting within the tritium-watch market.
ProTek PT1013B Specifications
Specification
ProTek PT1013B
Case material
Forged carbon composite
Case diameter
45 mm
Thickness
14.4 mm
Weight
73.2 g with strap
Lug width
22 mm
Movement
Miyota OS20 quartz
Functions
Time and date
Battery life
Approximately 10 years
Crystal
Double-domed sapphire with AR coating
Water resistance
300 m / 990 ft
Crown
Screw-down with guards
Bezel
Unidirectional, 60-click carbon composite
Illumination
ProGlo T25 tritium gas tubes
Strap
Blue natural rubber, 22 mm
Dial
Matte black with Arabic numerals and blue accents
Shock resistance
MIL-STD standards
Operating temperature
-20°C to +60°C
A Large Dive Watch That Isn’t Heavy
The first thing worth noting about the PT1013B is its size.
At 45 mm in diameter and 14.4 mm thick, this is a substantial watch. It is considerably larger than many conventional everyday watches, and the dimensions should be considered carefully by anyone with a smaller wrist.
The unusual part is the weight. Despite the large case, the PT1013B is listed at only 73.2 grams including its supplied strap. That is possible because ProTek uses forged carbon composite for the case and bezel rather than conventional stainless steel.
This gives the PT1013B a distinctly different proposition from a conventional stainless-steel dive watch. It retains the visual presence of a large professional instrument while avoiding much of the mass normally associated with a 45 mm case.
For someone who wants a large watch but dislikes the weight of a large stainless-steel case, that is potentially one of the PT1013B’s most useful characteristics.
Forged Carbon Composite Case
The case and bezel are made from forged carbon composite.
The material is intended to provide a high strength-to-weight ratio and impact resistance while keeping the watch relatively light. That is particularly relevant here because the PT1013B is designed around a rugged, military-oriented use case.
The material also gives the watch a very different appearance from a conventional steel dive watch. Rather than the polished or brushed surfaces normally associated with stainless steel, the carbon-composite construction contributes to the darker, more technical appearance of the PT1013B.
The large case and angular bezel reinforce that character.
Sapphire Crystal With Anti-Reflective Coating
The PT1013B uses a double-domed sapphire crystal with anti-reflective coating on the inner surface.
That is an important specification on a watch designed for demanding use. Sapphire provides substantially greater scratch resistance than mineral crystal, while the anti-reflective treatment is intended to improve readability by reducing reflections.
The double-domed construction also fits the watch’s instrument-like design. It provides the crystal with a pronounced profile while maintaining the scratch resistance expected from a modern premium tool watch.
For a watch in this category, sapphire is one of the specifications we would want to see.
300-Meter Water Resistance
The PT1013B is rated to 300 meters, or 990 feet.
The watch uses a screw-down crown with crown guards, and the existing specifications also identify a helium escape valve. The article states that individual pressure testing is performed under both dry and wet conditions.
A 300-meter rating puts the PT1013B firmly into serious dive-watch territory. Most owners will never approach that depth, but the rating provides substantial water-resistance margin for recreational diving, swimming and other water activities when the watch is properly maintained.
The helium escape valve is a feature more commonly associated with watches intended for professional saturation-diving applications. For the average owner it is unlikely to be necessary, but it reinforces the technical positioning of the watch.
ProGlo T25 Tritium Illumination
The PT1013B uses ProTek’s ProGlo tritium gas-tube system.
The existing specifications identify the tubes as T25 size and state that they provide continuous illumination for approximately 25 years.
This is an important distinction for anyone comparing the PT1013B with other tritium watches.
Tritium gas tubes generate their own light through radioactive decay, so they do not need to be exposed to sunlight or another light source before becoming visible in darkness. That makes them fundamentally different from conventional photoluminescent lume.
The PT1013B uses tritium in the hands and hour markers, with an additional illuminated bezel pip. The black dial and large illuminated markers are designed around nighttime readability rather than decorative lume.
T25 Versus T100
The PT1013B’s use of T25 tubes is worth highlighting because TritiumLume readers will often be comparing different tritium activity levels.
T25 is a relatively common specification among tritium watches. T100 tubes contain a higher activity level and can therefore produce a stronger initial glow, although tube design, colour, size and dial layout also affect how the illumination actually appears.
The PT1013B therefore belongs in the T25 category, rather than competing directly with watches built around T100 illumination.
That does not make the PT1013B’s illumination unsuitable. It simply gives prospective buyers an important specification to understand before comparing it with other tritium watches.
The Matte Black Dial
The dial follows the same functional philosophy as the rest of the watch.
It uses a matte black background with large Arabic numerals, blue accents and 12/24-hour markings. The hands are semi-skeletonized and incorporate tritium tubes, while the date display is positioned at 3 o’clock.
The large Arabic numerals should make the primary time display straightforward to read, while the secondary 24-hour markings provide additional information without changing the fundamental layout.
The blue accents also coordinate with the blue rubber strap on the PT1013B version described in the article.
The overall result is much more instrument-oriented than decorative. That is appropriate for a watch whose primary selling points are visibility, durability and water resistance.
The 60-Click Dive Bezel
The PT1013B uses a unidirectional rotating bezel with 60 clicks.
The bezel is made from carbon composite and incorporates raised blocks intended to provide a secure grip. That should be particularly useful when operating the bezel while wearing gloves or when the watch or user’s hands are wet.
There is also a luminous pip for dive timing.
The bezel is therefore functional rather than simply decorative. Its unidirectional design is consistent with conventional dive-watch safety principles because accidental rotation can only reduce the indicated remaining time rather than increase it.
Miyota OS20 Quartz Movement
The PT1013B uses a Japanese Miyota OS20 quartz movement.
The existing article describes it as a three-hand movement with date and gives a battery life of approximately 10 years.
Quartz is a logical choice for a watch built around low-maintenance utility. There is no need for manual winding, and the watch can remain ready for use without the owner having to think about power reserve.
The approximately 10-year battery life is particularly useful because it reduces the frequency of battery servicing.
This also gives the PT1013B a different character from mechanical dive watches such as the Marathon GSAR. The ProTek is fundamentally an instrument designed around convenience and reliability rather than mechanical horology.
Military and USMC Design
The PT1013B is explicitly presented as part of ProTek’s military-oriented range, and the existing article identifies the model as an Official Watch of the United States Marine Corps.
The USMC connection is also reflected in the watch itself. The dial carries United States Marine Corps wording, while the screw-down stainless-steel caseback features the Eagle, Globe and Anchor emblem.
For collectors interested in military watches, that heritage is likely to be an important part of the appeal.
It is worth separating that historical or institutional association from the watch’s technical specifications, however. The 300-meter water resistance, sapphire crystal, carbon-composite construction and tritium illumination are characteristics we can evaluate directly from the documented specifications.
The 73.2-Gram Weight Is Significant
The weight may actually be one of the most interesting specifications on this watch.
A 45 mm × 14.4 mm dive watch would normally suggest a substantial amount of wrist weight, particularly if constructed from stainless steel. The PT1013B is listed at only 73.2 grams with its strap.
That creates an interesting combination: large physical dimensions but relatively low mass.
For buyers who prefer the visual presence of a large dive watch but dislike heavy watches, the forged-carbon construction could therefore be more important than the military branding or even the tritium.
It also makes the PT1013B quite different from a stainless-steel watch such as the NITE Alpha Crest, which has a smaller 42 mm case but a substantially heavier construction.
Blue Rubber Strap
The PT1013B is described with a thick blue natural-rubber strap featuring a chevron pattern, a molded ProTek logo and a signed PVD-coated buckle.
The strap is 22 mm wide, which is a useful standard size for anyone who wants to explore alternative straps.
The blue colour is also an important part of the specific PT1013B configuration. It ties directly into the blue accents used on the dial and gives the otherwise black watch a distinct visual identity.
The strap is described as durable, comfortable and quick-drying, although those are specifications or product descriptions rather than qualities I can personally verify because I have not owned this model.
Shock Resistance and Operating Temperature
The PT1013B is listed as meeting MIL-STD shock-resistance standards and having an operating temperature range of -20°C to +60°C.
Those specifications reinforce the intended field-use character of the watch.
For most civilian owners, the watch is unlikely to encounter the full range of conditions implied by these specifications. Nevertheless, they demonstrate that ProTek designed the PT1013B around environmental durability rather than simply giving it a military-inspired appearance.
Who Is the ProTek PT1013B For?
The PT1013B is most interesting for someone who wants a large, lightweight dive watch with continuous tritium illumination.
The combination of a 45 mm case and only 73.2 grams is unusual. Add 300-meter water resistance, sapphire crystal, a screw-down crown, helium escape valve and a 10-year quartz battery, and the watch has a very substantial technical specification.
The T25 tritium system also makes it appropriate for someone who values continuous nighttime visibility but does not specifically require T100 illumination.
On the other hand, the 45 mm diameter and 14.4 mm thickness may be too much for someone looking for a compact everyday watch. The military styling and prominent USMC branding also make the watch less visually neutral than a conventional dive watch.
ProTek PT1013B vs. NITE Alpha Crest
The NITE Alpha Crest is a particularly relevant comparison within the TritiumLume review library.
Both watches use quartz movements, sapphire crystals, substantial water resistance and tritium illumination. Both also have a strong tool-watch orientation.
The biggest differences are the case materials, dimensions and tritium specifications.
The NITE Alpha Crest uses a 42 mm stainless-steel case, T100 illumination and 300-meter water resistance. The ProTek PT1013B is substantially larger at 45 mm, uses forged carbon composite, weighs only 73.2 grams with its strap, and uses T25 tritium.
That makes the comparison useful because the two watches approach the same basic problem differently: both are rugged quartz tritium dive watches, but the ProTek emphasizes low weight and large dimensions, while the NITE emphasizes T100 illumination and stainless-steel construction.
ProTek PT1013B vs. Luminox
The PT1013B also occupies some of the same territory as Luminox’s tritium-equipped tactical watches.
The most obvious difference is the case material. The ProTek uses forged carbon composite, while many Luminox models use CARBONOX or other lightweight case constructions.
The tritium specification is another useful point of comparison. The PT1013B uses T25 tubes, making it more comparable to T25-equipped Luminox models than to watches built around T100 illumination.
The ProTek’s 300-meter water resistance and helium escape valve also give it a distinctly dive-oriented specification set.
What Stands Out About the PT1013B
Several specifications make the watch particularly interesting:
The carbon-composite construction gives a 45 mm watch an unusually low listed weight.
The 300-meter water resistance puts it firmly into serious dive-watch territory.
The sapphire crystal provides the scratch resistance expected from a modern tool watch.
The 10-year quartz battery minimizes routine maintenance.
The T25 tritium system provides continuous low-light illumination without requiring charging.
The USMC design and caseback give the watch a specific military identity rather than generic tactical styling.
Taken together, those features make the PT1013B more interesting than a simple specification-sheet exercise.
Our Final Assessment
The ProTek PT1013B USMC Dive is an unusual combination of large dimensions, low weight, quartz simplicity and serious dive-watch specifications.
The 45 mm forged-carbon-composite case makes it visually substantial without the mass normally associated with a watch of this size. The sapphire crystal, screw-down crown, helium escape valve and 300-meter water resistance give it a specification set appropriate to a serious dive-oriented tool watch.
The ProGlo T25 tritium is another important part of the design. It provides continuous illumination without the need to charge the watch with light, although buyers who specifically want the stronger output associated with T100 tubes should recognize that the PT1013B is a T25 watch.
The biggest caveat in this review is my own relationship with the watch: I have not bought or worn the PT1013B. I therefore cannot give you a genuine hands-on assessment of its comfort, bezel action, accuracy, strap quality or real-world lume performance. What we can say from the documented specifications is that ProTek has assembled a technically serious package around lightweight construction and low-maintenance quartz operation.
For TritiumLume, that makes the PT1013B an interesting model to keep on the radar, particularly for readers who want a large military-style dive watch without the weight of a comparable stainless-steel case.
