The Titanium Field Guide

Edouard Koehn Tri-Compax Chronograph, open-worked dial

EK-CHR07SRBE, EK-CHR08SRGN, EK-CHR09SRBK, EK-CHR10SRSD, EK-CHR10SRIB

The Edouard Koehn Tri-Compax Chronograph, open-worked dial is a 41 mm Grade 5 titanium chronograph with an Edouard Koehn EKMVTCHR01 automatic movement.

All Edouard Koehn watchesChronograph watchesGrade 5 titaniumDisplay back
Material
Titanium
Grade / type
Grade 5
Water resistance
100 m
Reference
EK-CHR07SRBE, EK-CHR08SRGN, EK-CHR09SRBK, EK-CHR10SRSD, EK-CHR10SRIB
Type
Chronograph
Price
– · Price on request
Case diameter
41.0 mm
Thickness
14.5 mm
Origin
Switzerland
Movement
Automatic chronograph (Tri-Compax)
Caliber
Edouard Koehn EKMVTCHR01
Power reserve
48 h
Complications
Chronograph, Date
Colour
Grey
Finish technology
Natural finish
Caseback
Sapphire
Nickel-free
Unconfirmed (clasp or buckle material not confirmed)
Bracelet / strap
Vulcanized rubber strap, Grade 5 titanium folding buckle
Crystal
Sapphire, double-sided AR
Display back
Yes
Dial
Open-worked dial in blue (blue ceramic bezel, CHR07SRBE), green (green ceramic bezel, CHR08SRGN), black (black ceramic bezel, CHR09SRBK), or sand or ice blue (titanium bezel, CHR10SRSD and CHR10SRIB)
Dial colours
Black Blue Green Champagne
Lume
Luminescent hour markers and skeleton hands
Availability
Offered
Status
Current
Not published
Lug-to-lug, Weight, Hardness, Construction, Surface treatment, Matching bracelet
High confidence Verified Oct 2026 Source: Edouard Koehn (maker product page, EK-CHR07SRBE) / Edouard Koehn (maker product page, EK-CHR08SRGN) / Edouard Koehn (maker product page, EK-CHR09SRBK) / Edouard Koehn (maker product page, EK-CHR10SRSD) / Edouard Koehn (maker product page, EK-CHR10SRIB)
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Frequently asked questions

What grade of titanium is the Edouard Koehn Tri-Compax Chronograph, open-worked dial?

Grade 5, as stated by the maker. The caseback is sapphire.

What size is the Edouard Koehn Tri-Compax Chronograph, open-worked dial?

The case is 41 mm across and 14.5 mm thick. It is water resistant to 100 m.

How much does the Edouard Koehn Tri-Compax Chronograph, open-worked dial cost, and is it available?

It is in production, but the maker does not publish a price.

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