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The Ocean Series GMT continues Cestrian’s philosophy of building dependable, purpose-driven watches designed for real-world use, combining robust dive-watch capability with the added practicality of a second time-zone function. Engineered as a true everyday sports watch, it balances durability, legibility, and versatility in a format that feels equally at home on land, in the water, or during travel.
At its core is the reliable NH34 automatic GMT movement, chosen for its proven performance and ease of service, allowing the wearer to track a second time zone with clarity and precision. The solid stainless-steel case is built to withstand daily wear and demanding conditions, supported by a screw-down crown, sapphire crystal, and 200 metres of water resistance, ensuring the watch remains ready for adventure without compromise.
The silver-white dial offers a clean, technical appearance, created through a galvanic finishing process that produces a crisp metallic surface with refined light reflection. Applied indexes and polished nickel hands stand out clearly against the dial, delivering strong daytime readability, while Swiss Super-LumiNova provides dependable low-light performance. The orange-tipped seconds hand and lumed GMT hand introduce subtle contrast, preserving clarity without disrupting the watch’s understated aesthetic.
Completing the watch is a black Cestrian silicone strap, designed for durability and all-day comfort, secured with a classic pin buckle for a dependable fit. Like every Ocean Series model, this piece is built with longevity and usability in mind — a capable travel-ready dive watch that prioritises function, reliability, and honest value.
- Bi-directional rotor manual wind, hand wind and hacking movement
- 42 hour power reserve
- Tolerance of - 20 to +40 seconds a day
- Beat rate: 21,600
- Fully brushed finish, providing the watch with a distictive utilitarian feel.
- Surgical grade steel
- Extra-low carbon means it is ultra-resistant to corrosion and high temperatures
- Typically found on watches at a much higher price point
- High water resistance for a gmt watch, ensuring it can withstand more and last longer
- Super resistant to scratches
- Minimises glare for maximum clarity
- Robust and hard-wearing, typically seen as the most sought-after glass for a watch
- Adds depth and shape to the dial
- Angled metal surrounds expertly compliment natural light
- A better quality and long-lasting addition than painted indexes
- Swiss Super-LumiNova coating on the hands and markers. Absorbs solar light throughout the day, meaning it ‘charges’ as you wear the watch
- The addition of an etched closed case-back provides added durability, while bestowing the watch with a more streamlined case profile.
- More secure than traditional clasps
- Allow the watch to be unbuckled without widening, meaning it is much simpler to take on and off
- Cestrian shield logo placed on the dial at the 12 marker for a refined finish
- Every watch is provided a serial number, guaranteeing provenance and ensuring traceability
- Helps deliver maximum water resistance, allowing the watch to truly live up to its dive name
- Also makes it difficult for dust and other unwanted particles to enter the watch, preserving its lifespan
| Product Information | |
|---|---|
| Collection | Ocean Series |
| Country of Origin | P.R.C |
| Dimensions | |
| Case Diameter | 42mm |
| Case Thickness | 13.9mm |
| Lug Width | 22mm |
| Lug-to-Lug | 48.50mm |
| Weight | 187g |
| Case | |
| Case Shape | Round |
| Case Material | 316L Stainless Steel |
| Case Construction | 3 Piece |
| Case Finish | Vertically brushed with polished accents |
| Case Back | Screw-down |
| Case Back Finish | All polished with laser-etched markings |
| Bezel | |
| Bezel Type | GMT Hours Diver’s Bezel |
| Rotation | Bi-directional |
| Bezel Clicks | 24 Clicks |
| Bezel Insert | Circular brushed stainless steel |
| Bezel Triangle Luminosity | SLC1 Super-LumiNova (Green) |
| Crystal & Water Resistance | |
| Crystal | Flat Sapphire |
| Anti-Reflective Coating | 3 Layer |
| Water Resistance | 200m |
| Dial | |
| Dial Finish | Galvanic (Amber Yellow, Silver White, Deep Blue Fumé and Lagoon Green Fumé) Sunray (Tropical Blue and Black) |
| Markers | Applied Index |
| Minute Track | Standard |
| Luminosity | |
| Markers Lume | SLC1 Super-LumiNova (Green) |
| Hands Lume | SLC1 Super-LumiNova (Green) |
| Seconds Hand Lume | Super-LumiNova SBLC1 (Blue) |
| GMT Hand Lume | Super-LumiNova SBLC1 (Blue) |
| Lume Origin | Swiss |
| Movement | |
| Movement Brand | Seiko |
| Movement Reference | NH34 |
| Movement Type | Automatic GMT (self-winding and manual-winding) with hacking |
| Accuracy | -20 / +40 seconds per day |
| Power Reserve | Approximately 42 hours |
| Bracelet | |
| Bracelet Type | 3 Link Oyster |
| Bracelet Feature | Quick Release |
| Bracelet Style | Tapered |
| Bracelet Width | 22mm to 18mm taper |
| Bracelet Material | Stainless Steel |
| Bracelet Finish | Vertically brushed with brushed side walls |
| Clasp | |
| Clasp Type | Push-button deployment clasp with diver’s extension |
| Micro-Adjustment | 3-position ratcheted extension |
| Maximum Wrist Size | 24cm |
| Packaging | |
| Packaging Type | Cestrian Box |
| Packaging Colour | Black |
Pre-Orders
We'll send you updates regarding your order, with expected shipping start end of March.
UK Orders
FREE Next Day Delivery.
Order before 4pm for same day dispatch Monday to Saturday. Orders placed on Sunday will be dispatched on Monday.
We also offer Royal Mail Special Delivery service, which for an additional fee of £5.95 provides next day delivery by 1pm or for £12.95 delivery by 9am.
United Kingdom
Customs duties and import taxes are not applicable for UK orders, as all items are shipped from within the United Kingdom from our store in Chester. The price displayed at checkout includes VAT and free delivery (Tracked 24 only), so there are no additional charges upon delivery.
United States
All orders shipped to the United States are sent on a Delivered Duty Paid (DDP) basis. This means all duties, taxes, and import fees are included in the price shown at checkout. There will be no additional charges to pay when your order arrives, and all fees are handled by Cestrian Watches.
Rest of World
For orders shipped outside the United Kingdom and United States, duties and taxes may be charged by your local customs authority and are the responsibility of the customer. The total price displayed at checkout excludes any import duties or taxes and covers only the cost of the product and outbound shipping. These charges are determined by your local customs authority, paid directly to your courier or government, and are not collected by Cestrian Watches.
We are pleased to offer worldwide shipping. Shipping rates will be calculated at checkout once your address is provided.
More delivery details available here.
United Kingdom
Customs duties and import taxes are not applicable for UK orders, as all items are shipped from within the United Kingdom from our store in Chester. The price displayed at checkout includes VAT and free delivery (Tracked 24 only), so there are no additional charges upon delivery.
United States
All orders shipped to the United States are sent on a Delivered Duty Paid (DDP) basis. This means all duties, taxes, and import fees are included in the price shown at checkout. There will be no additional charges to pay when your order arrives, and all fees are handled by Cestrian Watches.
Rest of World
For orders shipped outside the United Kingdom and United States, duties and taxes may be charged by your local customs authority and are the responsibility of the customer. The total price displayed at checkout excludes any import duties or taxes and covers only the cost of the product and outbound shipping. These charges are determined by your local customs authority, paid directly to your courier or government, and are not collected by Cestrian Watches.
Legibility when light disappears.
Applied to the hands, indices, and key dial markers, Swiss Super-LumiNova® ensures the Ocean Series remains readable long after daylight fades. The glow is clean, even, and purposefully balanced — bright enough to perform, refined enough not to overwhelm.
Whether checking the time mid-flight, at night, or in low-light conditions, the Ocean Series stays clear and instantly legible when it matters most.
The term "Cestrian" is derived from the Latin name for Chester, "Deva Cestrianorum," and is typically used to refers to something or someone associated to the city of Chester in England. The brand originates in Chester and pays tribute to its roots. Chester is known for its rich heritage, stunning medieval architecture, and a vibrant atmosphere that seamlessly blends history with modern delights.
All Cestrian watches are proudly designed in the United Kingdom.
Currently all Cestrian watches are manufactured in China, through our close relationships with suppliers and manufacturers. China has become a global hub for watch production, offering a unique combination of high-quality manufacturing capabilities and cost efficiencies. Our decision to manufacture in China enables us to keep our production costs down without compromising on the quality of our watches.
Due to their mechanical nature, automatic watches have a tolerance. All Cestrian watches have a tolerance of -20 to +40 seconds a day thanks to their reliable Seiko NH35 automatic movement.
In order to limit costs and keep prices low, Cestrian follows a direct to consumer model. Our focus is on building our relationship directly with our customers through our website. We also sell on Amazon, eBay and Chrono24 to offer added convenience to our customers. WatchNation is an official launch partner for Cestrian and is the only other Authorised Dealer.
No, all Cestrian watches exclusively utilise automatic movements. We firmly stand by the notion that the craftsmanship, mechanical ingenuity, reliability, and timeless allure of automatic watches surpass any other alternative. Battery-powered quartz watches do not align with our vision, and thus we remain committed to the excellence of automatic watches.
All Cestrian watches are fitted with automatic movements. The watch movement is wound and powered by the motion of your warm. If you wear your watch regularly and it receives enough movement, it will continue to run without needing to be wound. Please review our ‘How to wind your automatic watch’ guide to learn more by clicking here.
Setting up your watch to the correct date and time is easy. Please click here to review our detailed how to guide.
Sizing a metal bracelet is a simple process but does require patience. Please visit our guide on how to size a bracelet.
Full details to activate your warranty can be found on the terms and conditions page. The warranty lasts 2 years from the date of purchase.
For added peace of mind, every Cestrian comes with a comprehensive warranty that covers manufacturing defects and faulty components. It’s in place to cover your watch for any faults that may occur with normal and reasonable use during the 2 year warranty period. Full details of the warranty can be found on the terms page.
While we always try our best to assist our customers, the warranty does have some exclusions. The warranty does not cover damage resulting from misuse, negligence, modifications or from accidents. Full details of the warranty can be found on the terms page.
We understand that for a variety of reasons, you may not be the original owner. As long as you have the original warranty card and a copy of the invoice, the warranty will remain valid for the 24 months from the original date of purchase.
Sizing the bracelet will not impact your warranty. Any abnormal damaged caused from incorrectly sizing the bracelet however may impact your warranty.
