I would say around 1996 to 1997. I don't have specifics. I have a 2nd Gen that has only the ".40", it's the one in the Sig line with the CLU prefix in the serial number. According to one of my guides that serial number prefix was manufactured between August and November of 1997. I know of some C series serial numbers that have the gen 3 frame, and the one in my sig line with DDT prefix was made in the Spring of 1999. I don't know if that helps, but I'm sure someone with more knowledge will be around shortly.
Last edited by D.S.Brown; 10-14-2010 at 22:27..