If you really want info on specific 3rd generation Pistol Manufacture Date, email [email protected] with model and full s/n and ask for Manufacture Date. This will probably work for late 2nd generation pistols with triple alpha S/N prefix and transitional pistols.
Depending on person that responds, you may get year or year & month or possibly Year, Month, and Day. There are various interpretations of Manufacture Date. It may be Actual Date Assembled, Date Label Created and Boxed, or possibly Date Shipped.
It may or may not match a decoded date based on box end 4 digit Spec...