4. Patek Philippe, ‘Calibre 89’ – $6 Million
Most of the other Patek Philippe watches on this list are relatively old creations. Not this one. In 1989, the Swiss luxury watchmaker decided to celebrate its 150th anniversary with what the company has called the most complicated watch in the world. It has 18 complications (features) and is two-sided. In addition to all the usual abilities you’d expect in a watch, this one includes such features as a star-chart, thermometer, sunrise and sunset indicator, chronometer, moon-phase indicator and full calendar with days, months and years. From start to finish it took 9 years worth of research, development and manufacturing to produce four of these watches.