All about the COSC Certification for Ollech & Wajs Watches

COSC is the acronym for Contrôle officiel suisse des chronomètres, an official Swiss chronometer testing institute. This independent organization certifies the high precision of mechanical wristwatch movements that meet certain strict accuracy standards. A COSC certification is considered a seal of quality for the highest precision and reliability in watchmaking.

What COSC means.

Official Swiss Testing Institute: COSC is the highest authority for certifying the precision of Swiss-made watches.

Independent Testing: The organization is a non-profit, independent body that conducts rigorous tests.

High Accuracy: Only movements that meet strict criteria (e.g., a daily rate deviation between -4 and +6 seconds) receive certification.

Testing Process: The tests last 15 days and include tests in various positions and at different temperatures.

Scope: Certification is exclusively limited to "Swiss Made" movements.

Difference to Chronograph: A chronograph is a function (stopwatch), while a chronometer is an extremely precise timepiece that requires COSC certification to bear the title.

What COSC certification means.

Trademark for Quality: It is a worldwide synonym for the highest precision and excellent craftsmanship.

  • Increase in Value: A COSC certification increases the value and prestige of a watch.
  • Guarantee of Reliability: Buyers can rely on the watch possessing demonstrably high technical quality and reliability.

For all Ollech & Wajs watches

Key questions at a glance

FAQs

About David from WATCHDAVID

Behind WATCHDAVID.SHOP, I, David Drilling, stand as a true watch enthusiast, watch photographer, and independent tester. Since 2018, I have been providing honest wear reports on my channels. In my shop, I exclusively sell watches whose quality and history I have personally verified. No anonymous mass-produced goods, but personal expertise.

Shipping & No Import Charges

Shipping within Germany and the EU is completely free for you and fully insured via DHL or FedEx Express. Important for you: There are guaranteed to be no import duties, taxes or hidden fees. The exact delivery time for your model will always be transparently displayed directly above the "Buy" button.

Cancellations & Free Returns

You can easily cancel your purchase within 14 days. Unlike other retailers, I will cover the full cost of your return shipping within the EU. Simply send me a short email to david@watchdavid.com and I will send you your free DHL return label. It doesn't get any more risk-free than that.

Authenticity & Condition of the Watches

I guarantee you 100% that all watches offered are unworn, brand new original goods. In the shop, I strictly differentiate between regular new goods directly from the manufacturer and exclusive photo watches. Photo watches are models that I have used for my videos or photos, or that come from a return. I sell them absolutely honestly as used and significantly reduced – but the full manufacturer's warranty only begins on the day of your purchase!

Warranty & David's "All-Round Carefree Service"

Every watch comes with the full, international manufacturer's warranty (at least 2 years). In the event of a warranty claim, you'll have absolutely no stress: I'll handle all communication with the brand and organize insured round-trip shipping for you. Even after the warranty period expires, I remain your personal point of contact for service inquiries.

Quality Control

Mechanical watches are fascinating masterpieces. Before dispatch, each watch undergoes a thorough optical and mechanical final inspection. Should a problem ever arise despite our secure transport protection, please inform me immediately by email. I will promptly arrange for a quick, uncomplicated replacement.

Further questions? About the watch? Anything else?

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