From The Manufacturer/Wikipedia/People Smarter Than Us:
The CZ 1911 A1 is an homage to the past, a 5” government sized model built as a modern incarnation of the original 1911 A1. That original was adopted into US service in 1924, ‘improving’ on John Moses Browning’s original design. Our version makes several small ‘improvements’ as well, swapping the checkered plastic grips for checkered walnut, adding serrated slide stop, magazine catch and mainspring housing and using a stainless steel barrel. For the sake of the shooter, we elected to forgo the lanyard loop, and added a taller set of sights that are easier to use, with the front dovetailed in so that it can be swapped more easily.