The Wristwatch Field Guide

Doxa SUB 300 Carbon COSC

C823N

The Doxa SUB 300 Carbon COSC is a current-production diver watch with a forged carbon case. It is priced well above the $1,195 median for the category.

Exotic-material diver watchesBlackDiversUnder $5,000
Price
$3,290
Material
Carbon
Grade / type
Forged carbon
Water resistance
300 m
Reference
C823N
Type
Diver
Case diameter
42.5 mm
Origin
Switzerland
Movement
Automatic, chronometer
Caliber
Sellita SW200 base (COSC)
Power reserve
38 hours
Complications
Date
Colour
Black
Construction
Assembled
Caseback
Titanium
Nickel-free
Not verified (clasp or buckle material not confirmed)
Bracelet / strap
Rubber strap; titanium inner chamber and screw-down caseback
Crystal
Sapphire
Display back
No
Dial
Professional (orange), Divingstar, Sea Emerald, Aquamarine, Whitepearl and other colourways
Dial colours
Blue Green Orange
Lume
Super-LumiNova
Availability
Offered
Status
Current
Not published
Thickness, Lug-to-lug, Weight, Hardness, Surface treatment, Matching bracelet
High confidence Verified Jul 2026 Source: Doxa SUB 300 Carbon (maker) / Monochrome Maker / listing ↗
Facts are free to cite with a link.
See it in the interactive guide

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More exotic-material watches from Doxa

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Frequently asked questions

What is the case material of the Doxa SUB 300 Carbon COSC?

The Doxa SUB 300 Carbon COSC has a forged carbon case with a titanium caseback. This is confirmed against the maker spec.

What size is the Doxa SUB 300 Carbon COSC?

It is 42.5 mm in diameter, and water resistant to 300 m.

How much does the Doxa SUB 300 Carbon COSC cost, and is it available?

It is current-production and lists from $3,290.

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