I am a newbie to this site, I didn't read every post on this thread but I did find two G17's with PEP prefixes ate two different gun stores today. One was nice enough to pull out the case and the test fire date was 01/2011. He also gave me a catalog which I can't find a date on but it has a page talking about the RTF2 finish. The gills were listed as SP2 slide serrations and the only two guns listed as available in the US are the 17 and 22.
I do have a G22 NBR prefix not sure of mfg date.