My old Glock Annual catalog from 1998 shows Gen2 .357 models on the cover, but the catalog section shows a Gen3 photo for the G17 and G22.
Browsing through the Serial Number Research Project thread here at Glock Talk (check post #5):
it looks like the first Gen3 G17 shows up in the CME serial number range, with a born-on date of November 1997, with a Gen3 G22 (CNW prefix) and a G19 (prefix CPH) showing up just a few months later in January of 1998.
Hope that answers your question!
"That means that no matter how we reform health care, we will keep this promise to the American people: If you like your doctor, you will be able to keep your doctor, period. If you like your health care plan, you'll be able to keep your health care plan, period. No one will take it away, no matter what." – President Obama, AMA speech, June 15, 2009.
see 13:20 - 13:58