Zephyr
Koa & Koa
- 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
On board the California Zephyr you can experience one of the most beautiful train routes of the USA. Zephyr operates daily in-between Chicago and San Francisco.
Our timepiece made of koa wood, Zephyr is dedicated to this unique railroad track and features a date display and stop function typical to chronographs.
- Case: 42mm diameter, made of koa wood and stainless steel in dark grey
- Dial: Koa wood with a fine grain
- Movement: Quartz movement by Citizen
- Bracelet: Adjustable length, made of koa wood and stainless steel in dark grey
NOW: Reserve your favourite watch with the new designs by pre-ordering now - only while supplies last!
PACKAGE CONTENTS
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.
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 do I get my watch running?
In order to get your watch up and running, remove all protective foils first. With a Quartz movement, you can directly set the time by turning the crown, which is the small calibration wheel on the side of the case. As soon as you’ve set it to the correct time, push the crown gently against the case and your watch will begin operation.
If you have an automatic or solar watch, you’ll have to first wind it up or charge the battery.
Core Features

Metal-Core Technology
Our Metal-Core technology has been especially developed in order to make our watch constructions with natural materials even more durable. With timepieces that have this special type of construction, the clockwork is encased in an airtight metal jacket that guarantees a waterproofness of up to 5ATM.
We thereby unify the best of two worlds: natural diversity of materials & the longevity of our designs.

koa wood
A piece of Hawaii for your wrist! Koa wood comes from the South Sea paradise and is one of the most popular woods in the world due to its unique grain. In its homeland, the wood is used to make surfboards and ukuleles, for example. The detailed surface texture, combined with golden to reddish brown colors makes every object made from koa wood a real eye-catcher. That's why you can find unique watches and jewelry made from this precious raw material - eye-catching accessories for a special look!

Chronograph Watch
Chronographs combine precision with a sporty look. On top of that, these watches have an integrated stop function, which makes your everyday life easier! The operation is very simple: there are two buttons on the side of the watch case. The upper one starts and stops the measuring process, and the lower one resets the stop hand to zero. Get your multifunctional timepiece and let it accompany you through your busy everyday life!

316L Stainless Steel
To protect our wood and stone materials from breakage and external pressures, we combine them with 316L stainless steel, also known as "surgical steel". The composition of iron, chromium, nickel and molybdenum makes it particularly robust and corrosion resistant.
The shiny surface provides a flawless look and can be easily coated with other colors. This is our secret ingredient that guarantees your unique piece nature has a long and exciting life!
Hello Nature-Lover!
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