World time: Patek Philippe and Louis Cottier

Patek Philippe - The Hong Kong Watch A Lot 877 July 2020

Patek Philippe World Time: dive into the complete history

A Brief History of the World (Time): Patek Philippe's Beloved 'Heure Universelle' Watch - Collectability

World Time, Reference 5110G A white gold world time wristwatch with prototype dial Circa 2003, Important Watches: Part I, 2023

Patek Philippe: Ref 5230: An historical review of the World Time

INSIDE THE MOVEMENT: LOUIS COTTIER - Collectability

Andersen Geneve Tempus Terrae - a special edition to commemorate Louis Cottier's WorldTime watch - Specs & price - Monochrome-Watches

The History of the World as told by World Time Watches

Patek Philippe - The Geneva Watch Auctio Lot 28 May 2021

The world timer complication was invented in the 1930s by Louis Cottier; a complication for travellers that needed to know the time in a specific time

Patek Philippe World Time White Gold Ref 5110G