The watch favored by Princess Diana of the United Kingdom is the Patek Philippe Calatrava, reference number 3618.
The Patek Philippe Calatrava 3445 belonged to King Charles.

Princess Diana's Watch - Part 2
The watch favored by Princess Diana of the United Kingdom was the Cartier Tank Française.

Princess Diana's Watch - Part 3
Princess Diana, a British royal, wore a vintage Patek Philippe with an 18k yellow gold oval case (21 mm).
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