Time & Tension The Journal

Perpetual calendar

Articles tagged “perpetual calendar”.

News Technique Historytechnique regulation explainer new release history small watches tourbillon patents marine chronometer longitude travel watch independents

The Patek Philippe Museum building in Geneva with red banners

New release

Patek Philippe's 5978P, and why an instantaneous calendar is so hard

13 October 2026

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Articles marked From the game world are fiction set in the world of Time & Tension. Brands and people in them are invented.