Limited edition: 15 pieces worldwide. Patek is what it is. At only 15 pieces world wide, the probability is very high that only a very few will see it in person.
Useful links: https://www.hodinkee.com/articles/whats-the-secret-sauce-hidden-inside-the-patek-philippe-advanced-research-projects-minute-repeater I https://www.patek.com/en/company/news/patek-philippe-advanced-research-fortissimo-ref-5750p
