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

Auction records for this reference suggest the timepiece will outperform estimates.

The back side of a wristwatch with the bezel open showing many dials and gears

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?