The most expensive wristwatch ever sold publicly was a Patek Philippe 1518 in stainless steel, which was the very first serially-produced perpetual calendar chronograph. Only four were made in stainless steel and it wasn’t shocking at all to see it reach eight-figure heights. The 1518 was also sold by Phillips in Geneva, and just a year ago in November 2016. The stainless steel Patek Philippe ref. 1518 perpetual calendar with chronograph.. Read More