Ralf Tech
WRB Automatic Full Lume - Full-Set

“Some watches remain legible in darkness. Others turn darkness itself into a dial, as though light had been stored beneath the crystal to reappear precisely when the surroundings become uncertain.”

RALF TECH WRB Automatic “Full Lume” reference WRB-1009, limited edition of 50 pieces, 39 mm satin-finished 316L surgical-steel case, 120-click unidirectional rotating bezel compliant with ISO 6425, black anodised aluminium insert with Super-LumiNova C5 triangular marker, semi-matte dial fully coated with Super-LumiNova C5, matte-black hour markers, 316L steel hands with luminous surfaces, no-date three-hand display, 2.5 mm domed anti-reflective sapphire crystal, screw-down crown, screw-down caseback engraved with the individual number within the series, 22 mm lug width, 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, watch made in France, fitted with a black leather strap and accompanied by its original black silicone strap, delivered as a 2026 Full Set in its Explorer case with documents, in near-mint pre-owned condition, fully inspected, authenticated and covered by a 3-year Mostra warranty.

The RALF TECH WRB Automatic Full Lume belongs to that second category. By day, its dial carries a pale, slightly ivory and almost mineral tone, framed by a black bezel retaining all the discipline of a professional diver. As light fades, the watch changes character: the entire dial begins to glow, the black markers become graphic references and the time remains immediately available. This transition from daytime restraint to a spectacular luminous presence gives the WRB-1009 an identity very few dive watches can claim.

The fully luminous dial is more than an aesthetic exercise. It answers one of the essential purposes of a professional watch: transmitting information when ordinary reading conditions disappear. Underwater, during night navigation, inside a dimly lit station, before dawn or at a bivouac, a glance is enough to recover the hours and minutes. Full Lume provides a much broader luminous surface than conventional markers, with reversed contrast that remains effective when the environment is almost entirely dark. The 39 mm satin-finished case greatly contributes to the success of the WRB. More restrained than the WRX and WRV, it retains the spirit of substantial RALF TECH divers while offering proportions suited to most wrists. The tonneau shape visually distributes volume, the screw-down crown remains protected by the case and the profile sits easily beneath a cuff. The watch has the reassuring density of an instrument without imposing dimensions reserved solely for operational use.

The 120-click professional bezel measures dive time or any useful interval in daily life. Its unidirectional action prevents accidental movement from suggesting that a diver has more time remaining underwater. Broad notching improves operation with wet or gloved fingers, while the luminous marker remains identifiable as light fades. This detail reminds us that Full Lume is not a colourful watch built around a visual effect: it remains a genuine diver following the principles of ISO 6425.   The 200-metre water resistance, screw-down crown, closed back and 2.5 mm sapphire crystal give this WRB a valuable margin of security. It can accompany the sea, pool, nautical activity, travel, rain and sudden changes of programme, naturally subject to water-resistance validation before immersion. For someone seeking one watch to wear often, this robustness removes the need to choose between a collector’s piece and a genuinely usable watch. The black leather strap turns the WRB into a more urban diver. It brings warmth, softens the presence of the case and allows the pale dial to become the central detail. With a shirt, jacket, sweater or blouson, Full Lume retains character without looking like misplaced equipment. The original black silicone strap reveals its first purpose: it withstands water, perspiration and heat, cleans easily and keeps the case stable during activity. The automatic RALF TECH RTA003 calibre continues this logic of reliability. It operates at 21,600 vibrations per hour, contains 24 jewels and offers an approximately 40-hour power reserve. Its proven architecture favours robustness, straightforward servicing and availability over unnecessary sophistication. Automatic winding maintains energy through wrist movement, manual winding makes restarting easy and hacking seconds allows precise setting.  

RALF TECH’s experience gives this construction particular legitimacy. Before producing watches, the Maison supplied diving equipment to the French Navy and its combat swimmers. In 2005, the first RALF TECH watch accompanied an autonomous dive to –330 metres. In 2010, Commando Hubert operators tested on deployment a watch developed with their input. The WRB itself was launched in 2019 in a version created for French Army divers before becoming available to the public. The civilian Full Lume is not an individually issued service watch, yet it benefits directly from this culture of testing, legibility and resistance.  

For the customer, this military experience should not be understood as decoration. It appears in the ergonomics of the bezel, screw-down crown, sapphire thickness, real water resistance, quantity of luminous material and simplicity of the movement. During operations, diving or isolation, every detail must reduce uncertainty. In civilian life, the same choices provide comfort, confidence and a watch less dependent on ordinary precautions. The WRB can therefore accompany diving, hiking, navigation, night work, technical interventions, travel and any activity where time must remain immediately available. Its 39 mm size allows long wear, its Full Lume dial improves reading when light disappears and its construction withstands changes of pace. It becomes professional through capability, not through an artificially martial appearance.

From a collector’s perspective, the limited edition of 50 pieces is a major argument. RALF TECH generally produces its confidential editions in small quantities; Full Lume stands among the most restricted WRB versions. Yet its rarity does not rest on a number alone. It possesses a technically and visually distinctive dial, a genuine night-time function, true dive-watch architecture and an immediately recognisable identity within a collection dominated by black or blue dials.   The 2026 Full Set strengthens that coherence. The Explorer case, documents, original silicone strap and elements associated with its first presentation preserve the context of the watch. On an edition of only fifty pieces, this completeness supports traceability, strengthens future collector interest and allows the owner to retain a configuration faithful to its history. Its near-mint condition adds an immediate advantage. The case brushing retains definition, the bezel preserves precise action, the dial keeps its full luminous capacity and the straps allow a choice between urban and sporting use. The watch can enter a collection without feeling as though it has lost its freshness while remaining ready to be worn without excessive restraint. This example is offered as a 2026 RALF TECH WRB Automatic Full Lume WRB-1009 Full Set, limited to 50 pieces, fitted with a black leather strap and accompanied by its original black silicone strap, Explorer case and documents, in near-mint pre-owned condition. It has been carefully inspected to provide a transparent reading of its authenticity, operation, individual number and completeness.

Choosing a RALF TECH WRB from Mostra brings a particular advantage with a dive watch intended for genuine use. Since 2025, the Mostra workshop in Aix-en-Provence has been officially recognised as a Certified RALF TECH Technical Centre for pre-owned watches. Checks cover the movement, crown, bezel, seals and water resistance, using procedures and tooling suited to the Maison’s requirements. This Full Lume comes with a certificate of authenticity, priority support and a 3-year Mostra warranty.  

A watch such as the WRB-1009 is chosen for its ability to remain readable when light disappears, for its versatile size, genuine dive-watch resistance and the military experience informing RALF TECH design. It is also chosen for the more intimate pleasure of a dial that changes completely between day and night, for the rarity of its fifty examples and for one essential quality: entering a collection without ceasing to be a watch one genuinely wears.