This is a question I've been curious about for a while and I still haven't found the answer.

Why are most date windows on watches rectangular?

The vast majority of watches are round. Markers vary in size and shape. I can understand when a rectangular marker is used when it matches the size and shape of other markers on the dial. I think the Tudor Pelagos is an excellent example of matching the markers and date windows.

(Picture borrowed from the Internet.)


What about watches that do not have rectangular markers? Round date windows on a round watch seem to make more sense.

For example, I was wearing this Ball Fireman Racer today. Not only does it have a rectangular date window, it also sports a circular cyclops over the rectangular window.



Why do most watch designers seem compelled to keep a rectangular date window?

There are a few examples of watch makers that stray from the norm and use circular date windows. One example is Muhle Glashütte. Here is a picture of my Seebataillon with a round window. To my eye it seems more pleasing than a rectangular window.



The Benarus Moray also had a round window.



Any thoughts on why date windows are usually rectangular? Do you have a preference?