To my knowledge, there are only three Patek Philippe World Time ref. 2523 with a cloisonné enamel dial depicting a map of South America . The first one has never appeared in public: it is only described on page 159 of the book by Giampiero Negretti & Paol...
But my fear is that, given the insane price he will have to pay, this watch will instantly go for a long sleep in a safe... Let's hope not nonetheless. Best, Emmanuel