1. The perpetual calendar
A proper watch collection should definitely include a timepiece with a perpetual calendar.
Often deemed the most romantic and useful watch complication, the perpetual calendar shows the date, day, month and year, and accounts for leap years over a period of 100 years. It also only needs to be adjusted just once per century.
While perpetual calendars are relatively easy to come by these days, that wasn’t the case back in the 1980s and ’90s when I was starting my collection.If you did see one back then, you’d gasp and—after the initial shock wore off—call your family and friends to tell them about it. Just like with supercars today.
See also: Why You Should Get His & Her's IWC Moon Phase Watches This Christmas