Description
The CASIO OCEANUS OCW-T4000BA-1A3JF represents the fusion of advanced technology and refined Japanese craftsmanship. Featuring a full black DLC-coated titanium case and bracelet, it delivers exceptional lightness, durability, and a sophisticated stealth aesthetic. The green vapor-deposited dial adds depth and subtle color variation, creating a distinctive yet elegant presence within the OCEANUS lineup.
Equipped with Tough Solar power, Multiband6 radio-controlled timekeeping, and Bluetooth smartphone link functionality, the watch ensures precise time synchronization anywhere in the world. Through the CASIO WATCHES app, users can easily manage world time across approximately 300 cities and automatically adjust time zones and daylight saving settings.
With 10-bar water resistance, dual anti-reflective sapphire crystal, and Zaratsu polishing for a high-end finish, the OCW-T4000BA-1A3JF is designed for both daily reliability and premium comfort. As a Japan Domestic Market (JDM) model released in May 2021, it stands as a versatile luxury sports watch combining functionality, precision, and understated elegance.
Key Specifications
- Case: 48.1 × 42.8 × 11.9 mm, approx. 90g, titanium (DLC coating)
- Bezel: Titanium with DLC coating
- Band: Solid titanium bracelet, slide-adjust clasp
- Water resistance: 100m (10 ATM)
- Movement: Tough Solar (solar-powered quartz)
- Battery/Power: ~5 months (normal use), ~20 months (power saving)
- Accuracy: Radio-controlled / ±15 sec/month (non-sync)
- Display: Analog, green vapor deposition dial
- Functions: World time (27 cities / ~300 via app), stopwatch, full auto calendar
- Special features: Bluetooth, Multiband6, dual time, power saving
- Illumination: NeoBrite
- Additional: Sapphire crystal (dual AR), Zaratsu polishing
- Origin: Japan Domestic Market (JDM / Made in Japan)
- Warranty: 1–3 years
- JAN/Model Code: OCW-T4000BA-1A3JF
- Release date: May 2021
Key Highlights
The OCW-T4000BA-1A3JF stands out as a full-spec “black titanium Oceanus,” combining DLC coating with lightweight titanium construction. This creates a premium, scratch-resistant finish while maintaining exceptional comfort for daily wear.
Its integration of Bluetooth smartphone sync and Multiband6 radio control ensures near-perfect time accuracy globally. This dual-sync system eliminates manual adjustments, making it an ideal travel watch.
The green vapor-deposited dial introduces a subtle yet distinctive character, shifting appearance depending on lighting conditions. This adds depth to the otherwise stealth-oriented design.
Positioned within the OCEANUS Classic Line, this JDM model is widely regarded as a high-value premium solar radio watch—offering luxury-level finishing and advanced functionality at a more accessible tier than traditional Swiss counterparts.