My serial number starts with DLTxxxUS
According to the chart in the link above (cut&paste);
DLT - G-23 - Unknown - 3rd Gen. - MEP FACTORY NSs
The listing falls between December 1999, and January 2000.
Yes it's a 3rd gen G23.
My Father, now retired LEO after 48 years, won this in a raffle at a LEO only event sometime just shortly after those dates if I remember correctly. It came in the old style tupperware type box with three 13rd mags that are stamped "Restricted LE/GOVT only". I believe that time period forbade citizens from having 13rd mags. He took it home where it sat new & unused for many years until he gave it to me.
But can anyone enlighten me what MEP FACTORY NSs means? All in all, it appears to be a standard 3rd Gen G23.
And yes...it's also properly registered in my name now.