Patek Phillipe Ref. 2523 auction – what is a world time watch?

Only two yellow gold examples of the Patek Philippe Ref. 2523 with the South America cloisonné enamel dial are known to exist.

A watch with a dial with an enamel map of south america on a blurry pink and blue background

The 1953 Patek Philippe Ref. 2523 Heures Universelles belongs firmly to the second category, so exceptionally rare that its appearance at Phillips’ Geneva Watch Auction: XXIII this May

Patek Phillipe Ref. 2523 auction – what is a world time watch?