Professional Description

The Casio Oceanus Manta S400 RETRO TONE COLLECTION OCW-S400RL-8AJR represents the pinnacle of Casio’s “Elegance, Technology” philosophy. Produced under the rigorous standards of the premium manufacturing line in Yamagata, Japan, and intended exclusively for the Japanese Domestic Market (JDM), this piece is a true collector’s gem with a worldwide production strictly limited to just 300 pieces.

This model reinterprets classic sophistication through the Retro Tone theme, combining a case sculpted from solid titanium with a titanium carbide (TiC) coating and subtle accents in ion-plated gold (Gold IP) on a bezel featuring a sapphire crystal insert. Its three-hand design with date display achieves perfect proportions: a diameter of 41.3 mm and a record-breaking thickness of just 9.2 mm, making it an extremely ergonomic and lightweight dress watch. Equipped with the Solar Caliber 5728, it combines an inexhaustible light source, Multi-Band 6 atomic synchronization, and Bluetooth connectivity to ensure absolute precision on a dark gray dial of profound minimalist beauty.

Key Features

• Ultra-Limited Global Run (Only 300 Pieces): One of the most exclusive editions ever released in the Oceanus Manta line. Its limited production and distribution restricted to the Japanese market make it a coveted object of desire for international collectors.
• Ultra-Thin Manta Profile (9.2 mm): Thanks to advanced high-density assembly engineering in the 5728 caliber, the watch offers an extremely slim silhouette that slips effortlessly under a shirt cuff.
• Titanium with Carbide (TiC) Coating and Gold IP Accents: An ultralight, hypoallergenic titanium case, treated with a scratch-resistant surface hardening process, featuring hand-polished Zaratsu finishing and gold IP accents that enhance its aesthetic appeal.
• Double-Curved Sapphire Crystal: Maximum scratch resistance with a high-transparency anti-reflective coating on both sides (Dual-Curved Sapphire), offering a crystal-clear view of the dial from any angle.
• Dual Synchronization (Bluetooth® + Multi-Band 6 Radio-Controlled): Absolute precision thanks to automatic reception of radio waves from international atomic clocks and wireless connection to a smartphone for time zone adjustment and real-time watch diagnostics.
• Tough Solar Power: High-performance solar module that recharges the battery using natural or artificial light, ensuring extended battery life in total darkness with power-saving mode.
• Selected Genuine Leather Strap: Black genuine leather strap with a refined, supple feel, featuring a folding clasp to preserve the material’s longevity.

Technical Specifications

Component / Feature Technical Detail
Brand and Collection Casio Oceanus (Manta S400 Series - Retro Tone)
Reference / Model OCW-S400RL-8AJR (JDM Limited Edition - 300 Units)
Manufacturing Made in Japan (Yamagata Premium Production Line)
Movement / Caliber Solar Quartz with Bluetooth (Casio Caliber 5728)
Case Material Titanium with carbide coating, sapphire bezel, and Gold IP accents
Case Dimensions Diameter: 41.3 mm | Thickness: 9.2 mm (Ultra-Slim Design)
Crystal Curved sapphire crystal with high-clarity anti-reflective coating
Dial Dark gray satin finish (Dark Gray) with contrasting accents
Strap Premium genuine leather, black, with folding clasp
Water Resistance 100 meters (10 ATM / 10 Bar)
Case Back Solid titanium with commemorative limited-edition engraving

Smart Features and Technical Performance

• Smartphone Link (Bluetooth): Automatically connects to the dedicated app for automatic time adjustment 4 times a day, hand position correction, and battery status.
• Radio-Controlled Signal Reception: Automatic synchronization with atomic reference stations in Japan, North America, Europe, and China (Multi-Band 6).
• Full Perpetual Calendar: Native automatic programming that corrects for short months and leap years through the year 2100.
• Neobrite Luminescence: Faceted hands and hour markers coated with highly reactive luminescent paint for instant readability in low light.
• Date Indicator: Discreet date window at the 3 o’clock position, perfectly integrated into the visual harmony of the dial.