Watch companies love celebrating anniversaries - about as much as we love reporting on them. And it makes sense, after all, horology and watchmaking is literally the study and measurement of time, and when an important watch turns an important age, it's time to celebrate!

This year, two of our favorites in the world of sport watches turn a half-century: the Rolex Cosmograph Daytona and the TAG Heuer Carrera. These two watches share a lot in common, and though you will never hear much about their similarities from Rolex or TAG, you will from us.

What you will hear from Rolex and TAG this year is how each model helped form what we think of as the racing chronograph today - and both have valid claims. What is also interesting to note is that both of these watches really hit the shelves in 1964, but some models leaked out in 1963 and they differ from the later models in a few ways. We'll run you through that in the coming months.

For now, sit back, relax, and ponder what the 50th anniversary of these two icons will bring us when Basel World rolls around.