Well, this is a big one! Ahead of Only Watch 2019, taking place right now in Geneva, there was speculation that the unique stainless steel Patek Philippe Grandmaster Chime ref. 6300A might become the most expensive wristwatch to ever sell at auction, and it turns out that was well founded. It just happened. The watch, with its two dials, reversible case, and 20 complications, sold for CHF 31,000,000, officially making it the most expensive watch in the world.