To read more about this watch, check out Ben's extremely in-depth story here, which includes interviews with Aurel Bacs, Davide Parmegiani, and Alfredo Paramico, not to mention offering a look at where each of the four known steel 1518s have been since the day they were made.

This watch takes the title of most expensive wristwatch in the world from the piece-unique Only Watch Patek Philippe ref. 5016 sold just one year ago.