Ralf Tech
WRB Automatic Ocean Metal - Stainless Steel

“Some dive watches are made to descend beneath the surface. The finest also know how to return with us, cross the city, travel and difficult days without ever losing the simplicity of a genuine instrument.”

RALF TECH WRB Automatic Ocean Metal reference WRB-1203, the official designation of the Ocean Metal model, limited edition of 100 pieces, 39 mm satin-finished 316L surgical-steel case, matte ocean-blue no-date dial, Super-LumiNova BGW9 hands and hour markers, 120-click unidirectional rotating bezel following ISO 6425 principles, black anodised aluminium insert with luminous marker, screw-down crown positioned at 4 o’clock, 2.5 mm domed anti-reflective sapphire crystal, numbered screw-down caseback, 200-metre water resistance, RALF TECH calibre RTA003 self-winding mechanical movement operating at 21,600 vibrations per hour, approximately 40-hour power reserve after full winding, 24 jewels, original Heavy Duty steel bracelet with Easy Lock folding clasp, second original black silicone strap and complementary black leather strap, Explorer case and documents, watch made in France, offered as a 2026 Full Set in near-mint pre-owned condition, fully inspected, authenticated and covered by a 3-year Mostra warranty. 

The RALF TECH WRB Automatic Ocean Metal belongs to a generation of modern divers that no longer requires a choice between professional use and daily life. Its architecture remains that of a watch created for water: unidirectional bezel, screw-down crown, strongly contrasted dial, thick sapphire crystal and serious water resistance. Yet its 39 mm diameter and steel bracelet give it sufficiently measured presence to accompany a shirt, jacket, business journey or city day with equal ease. The ocean-blue dial forms the centre of the reference. Its colour does not attempt to reproduce a uniform decorative blue. It recalls water whose depth changes with light: brighter as sunlight crosses the surface, denser in shadow and almost nocturnal when the dial disappears beneath a cuff. The black bezel contains the colour and strengthens legibility, while pale markers provide immediate points of reference.

Underwater or as light fades, the Super-LumiNova BGW9 surfaces take over. Information remains direct, without a date window or secondary indication interrupting the balance. This simplicity is a genuine advantage for a diver, sailor, hiker or anyone wishing to read the time without taking out a phone, waking a screen or relying upon a network.   The 120-click bezel measures dive time, an exercise interval, a stage of navigation or any useful duration during an active day. Its unidirectional action prevents accidental movement from suggesting that more underwater time remains. Broad notching allows safe operation with wet, cold or gloved fingers. The function remains elementary, and that is precisely why it is dependable. The 200-metre water resistance gives this WRB a safety margin extending far beyond occasional swimming. Sea, pool, sailing, paddleboarding, recreational diving, heavy rain, heat, dust and travel can be approached without the precautions required by a dress watch, naturally subject to valid pressure testing before immersion. A modern sports watch becomes genuinely useful when it allows the day to continue instead of forcing its owner to remove it.  

The Heavy Duty steel bracelet strengthens the sensation of solidity. Its links extend the case, distribute weight and give Ocean Metal a more structured presence than a rubber-mounted WRB. The Easy Lock clasp secures the wrist and allows the watch to become a true daily piece. On steel, it moves from sea to city without changing personality. The original black silicone strap immediately restores its nautical vocation. Better suited to water, perspiration and heat, it belongs to sporting days, holidays and outdoor activity. The complementary black leather strap offers a third interpretation, warmer and more urban. This variety creates a practical benefit: one watch can assume three uses without losing identity.  

The WRB was conceived as a more compact answer to the WRX and WRV while preserving RALF TECH’s culture of robustness, legibility and water resistance. The Maison presents it as its most versatile diver, built around a 39 mm format suitable for many wrists without abandoning the essential functions of a genuine dive watch. Ocean Metal adds a professional steel bracelet and a more maritime blue dial to that foundation.   The automatic RALF TECH RTA003 calibre supports this philosophy without unnecessary complication. Its 21,600-vibration frequency, 24 jewels and approximately 40-hour power reserve favour proven mechanics, understandable servicing and sustainable maintenance. Automatic winding maintains energy on the wrist, manual winding makes restarting easy and hacking seconds allows precise setting.   RALF TECH’s professional and military diving experience gives the construction particular credibility. Before developing watches, the Maison supplied diving equipment to the French Navy and its combat swimmers. It states that a watch developed with Commando Hubert was tested on deployment in 2010, and that its WRX, WRV and WRB models have since equipped various specialist French and foreign units. This civilian Ocean Metal is not an issued watch, yet it directly benefits from that culture of field use and operational feedback.

For the owner, this heritage translates into simple benefits: rapid reading, a protected crown, an easily gripped bezel, thick sapphire, genuine water resistance and dimensions comfortable enough for prolonged wear. The same qualities serve the diver, sailor, traveller, outdoor professional or anyone wanting a dependable watch when plans become unpredictable.From a collector’s perspective, the limited edition of 100 pieces has genuine coherence. The ocean-blue dial, Heavy Duty steel bracelet, 39 mm format and French production clearly distinguish this version within the WRB family. Its rarity rests not only on an engraved number, but upon an immediately recognisable configuration, real usability and a still-confidential French identity.  The 2026 Full Set strengthens that interest. The Explorer case, documents, original straps and complete presentation preserve the watch’s context. Its near-mint condition offers a clean case, precise bezel, luminous dial and steel bracelet retaining all its presence. It can enter a collection without ceasing to be a watch designed for wear. This example is offered as a 2026 RALF TECH WRB Automatic Ocean Metal WRB-1203 Full Set, with its Heavy Duty steel bracelet, original black silicone strap and complementary black leather strap. It has been carefully inspected to provide a transparent reading of its movement, water resistance, individual number and completeness.

Choosing a RALF TECH WRB from Mostra brings particular reassurance with a diver intended for genuine use. Since 2025, the Mostra workshop in Aix-en-Provence has been recognised as a Certified RALF TECH Technical Centre for pre-owned watches. This Ocean Metal benefits from appropriate inspection, a certificate of authenticity, priority support and a 3-year Mostra warranty.  A watch such as this WRB Ocean Metal is chosen for the depth of its blue dial, the versatility of its proportions, the freedom offered by three straps and the confidence of genuine dive-watch construction. Above all, it is chosen for one rare quality: professional enough for difficult conditions, discreet enough for every day and limited enough to retain real collector appeal.