The Wristwatch Field Guide

Casio Oceanus Manta OCW-S400

OCW-S400-1AJF

The Casio Oceanus Manta OCW-S400 is a current-production watch with a titanium (titanium carbide treatment) case, finished with titanium carbide treated titanium. At 79 g it sits around the middle for watches in the guide, and is priced well under the $1,500 median across the guide.

All Casio watchesExotic-material other watchesTitaniumUnder $5,000
Price
$760
Material
Titanium
Grade / type
Titanium (titanium carbide treatment)
Weight
79 g (with bracelet)
Water resistance
100 m
Reference
OCW-S400-1AJF
Type
Other
Case diameter
41.3 mm
Thickness
9.2 mm
Origin
Japan
Movement
Tough Solar, Multi-Band 6, Bluetooth
Caliber
Casio 5728
Complications
Date
Colour
Grey
Surface treatment
Titanium carbide treated titanium
Caseback
Titanium
Nickel-free
Not verified (clasp or buckle material not confirmed)
Bracelet / strap
Titanium
Crystal
Sapphire
Display back
No
Dial
Black
Dial colours
Black
Lume
Neobrite
Availability
Offered
Status
Current
Not published
Lug-to-lug, Power reserve, Hardness, Construction, Matching bracelet
Medium confidence Verified Jun 2026 Source: Casio Maker ↗
Facts are free to cite with a link.
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Frequently asked questions

What is the case material of the Casio Oceanus Manta OCW-S400?

The Casio Oceanus Manta OCW-S400 has a titanium (titanium carbide treatment) case with a titanium caseback. It is recorded at medium confidence pending a maker-stated material.

What size is the Casio Oceanus Manta OCW-S400?

It is 41.3 mm in diameter, 9.2 mm thick, and water resistant to 100 m.

How much does the Casio Oceanus Manta OCW-S400 weigh?

About 79 g (w/ bracelet).

How much does the Casio Oceanus Manta OCW-S400 cost, and is it available?

It is current-production and lists from $760.

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