Your second generation G-19 was made around July, 1993.
If you go to the "Valuable Info Forum" (the next forum above this one in the forum list), and click on the "Glock Serial Number Research Project" you can see a list of all the serial number prefixes, when they were made (or more accurately, shipped), and some other features. I started that thread many years ago to get us Glock Collectors an idea of when changes happened, how many Glocks of each model were made, and cut-off dates for introduction/discontinuence of models. Dan has taken it over and made it his own, and he's done a MUCH better job than when I started it...
You should submit your gun's info to the thread, so it can be added to the list. (It's currently not on there.) You can also call Glock and get the "born-on" date, so you can submit accurate information to the thread.
Here's the link: http://www.glocktalk.com/forums/showthread.php?t=412093