The folks at Watchfinder had the opportunity to take a close look at the Patek Philippe Grand Complications 5270/1R, a wristwatch costing $200,000. The way it handles days of the months and leap years is impressive.
I don't own an expensive collectors watch (unless the Apple Watch counts as one), but if I had to choose one I'd go with an Accutron Spaceview. At 1/100 the price of this Patek Philippe, it's still pretty expensive!
Image: YouTube