Ok thankyou. I did some research, and found that as well about the lettering system for numbers for year of production. This sig doesn't have that, and in 2004 I believe they started putting rails on(which mine doesn't have), and in 1998, they started adding the coiled spring, for the firing mech, and coiled it (I don't know the name of this particular part, so someone interject please), in earlier models it was rubbing against the frame and would cause damage so in 1998 they changed it. So that's the best I could come up with, roughly in between 1998 and 2003 was this pistols production.
*If this helps, it was a CPO gun that came in a red box, that could tell me more about the age of it, if I knew when they started their CPO program, perhaps someone on here may have more insight than what I have already found??? Thanks Shooter Above for your input.