CZ has a date stamped adjacent to the proof mark on the CZ75 models. This is located just behind the ejector port on both 75SA's that I have in front of me. The stampings are 00 and 01, which are consistent with the pattern testing documents provided by the manufacturer. The oldest of the two has a pattern test dated in Nov 2000, and the latest was pattern tested in Mar 2001.
The serial numbers on each pistol do not seem to follow the same pattern as yours. Both numbers begin with an "A" and end with an "X" with 4 numeric digits in between. CZ-USA is required to keep records of what serial numbers were sold and to whom, and when, but I don't think they have any date significance. Have a good day!
Ralph
