Koh Mak
Walnut & Marble
Discover our Koh Mak with solar movement and say goodbye to changing batteries!
- Delivery: 2 - 5 workdays
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Free express shipping worldwide
Our customers enjoy free express delivery without any import duties or taxes! Learn more>
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24 months warranty
If you find a defect in your model, please contact our customer support and we’ll find the best solution for you. Learn more>
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Extended refund period until January 31, 2024
You can return your model within the extended return period until January 31, 2024. For our Premium Club members, we also cover the return shipping costs and provide a prepaid return label. Learn more>
- No after-sale duties or taxes for US customers
Meet one of our favorite solar-powered chronographs “Koh Mak”. Featuring a genuine blue marble dial , a bracelet made from stainless steel in silver and walnut wood elements, this timepiece blends form and function.
- Case: 45mm diameter, made from walnut wood and stainless steel in silver
- Dial: Genuine blue marble
- Movement: Solar movement by Seiko
- Bracelet: Adjustable, made from walnut wood and stainless steel in silver (fits any male wrist)
- Innovative Easy-Switch Interchangeable Bezel System
PACKAGE CONTENTS
What is delivered in the package contents?
Every single Holzkern product is delivered in a high-quality solid wooden box in which your piece of nature can be safely stored. The wooden box is lined with cork, which optimally protects your model during transport or storage.
The cork that comes with our watches and Bandlets is reversible and inscribed on both sides respectively with the sentence in German - “So einzigartig wie du”, as well as English - “As unique as you”.
For all models with linked bracelets, we additionally send the matching extension links including tools free of charge. In this way, you can individually adjust your personal piece of nature and immediately start wearing it. :)
How does a solar watch work?
If you’ve decided on a watch with solar movement, starting it up works a little differently. In this case, there is an inbuilt battery that is recharged via the energy of the sun or a light source.
In order to charge your solar watch, remove the protective foil from the glass and charge it for a minimum of 5 hours in direct sunlight. Particularly in months with less sunshine, the watch should be charged under a lamp (at a distance of 20cm) for 60 hours (30W lightbulb/6W LED/Lumen 375) because the sunlight is slightly too weak to recharge the battery.
Please note that your solar watch shouldn’t be exposed to excessive heat (e.g. the blazing midday sun) in order to avoid damage. As soon as your model is recharged, the battery will last for at least 4 months without the need to recharge your watch again. When the seconds hand begins to tick in 2-second intervals, it’s a sign that your timepiece needs light again and should be recharged.
In case your model has a variety of functions, like e.g. a date display, a dual time display or a chronograph, get to know these functions in advance in order to maximize the full potential of your watch.
How do I adjust my watch to the perfect size?
With so many different designs, there’s definitely the perfect model for every wrist size. Our watches with linked bracelets can be easily adjusted to any preferred length.
Additional bracelet links and the necessary tools are enclosed free of charge so that you can immediately adjust your model to your individual wrist size and wear it.
The leather watch straps and vegan alternative straps in our product range come in industry-standard sizes. For particularly short or long watch straps, you’re sure to find what you need at your trusted specialised watch or jewellery dealer.
Core Features
Solar-Tec Movement
Timepieces with Solar-Tec movements use a source of energy that should be applied to as many of life’s situations as possible: the power of the sun.
Choose a model with Solar-Tec and forget about the problem of a battery change that comes with Quartz watches or the need to wind up automatic models.
With highly efficient solar panels and a battery runtime of 6 months or more, your watch with Solar-Tec will never let you down.

Walnut wood
Elegant & durable. The distinctive grain and the diverse range of colors from chocolate brown to almost black brown make this type of wood one of our favorites for the production of watches, jewelry, sunglasses and handbags. In addition, walnut wood impresses with its high density and the associated stability, which promises your piece of nature a long life! Our walnut wood comes mainly from North America and is 100% FSC certified.

marble
A touch of luxury. The name "marble" comes from the Greek word "mármaros", which means "shining stone". The history of marble dates back to ancient Greek and Roman art, where marble was used for sculptures and architecture. With its distinctive texture and coloring, marble provides a particularly aesthetic appearance that makes our watches and jewelry made from this stone very special statement pieces.
Easy-Switch Bezel
Making our watches even more unique? We make it possible with our Easy-Switch interchangeable bezel system. A specialized construction of the case and bezel allows the bezel to be removed, and replaced via a simple twist movement, with watches that have this function.
One watch - an endless amount of styles. Long live diversity!
Hello Nature-Lover!
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