IWC watchmaker Thomas Zimmermann at work on the Portugieser Eternal Calendar. @iwcwatches

Uploaded January 2026 | Updated September 2026, 2 weeks ago

One watchmaker. A few million years of precision.

IWC watchmaker Thomas Zimmermann at work on the Portugieser Eternal Calendar. Hand-assembled, engineered for 400 years, and with a Double Moon™ display accurate for over 45 million years.

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