This incredibly rugged watch features a specially protected crystal bezel. 
 
The crown is hidden and protected by a finely-turned cylindrical metal screw and silicone gasket. The screw is anchored to the case by a linkage that also protects the “Weekday Adjustment” button from being triggered accidentally. The backplate comes with a mineral glass and we can see the robust automatic movement.

The Excalibur is built such that it will survive anything you do, and come out of it looking good and telling you the right time.