Quoted: Are there really small letters under the front part of the slide?
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Yes, there are 2 weird little symbols, and under them the letters KB ... If it helps, I can post a pic of the symbols.
I found a clue to rough out it's age ... I just bought one of the Hogue wraparound grip sets, and when I was installing it, the instructions pointed out the Old and New style trigger(which they say started being used in the mid-90's) return spring ... Mine has the Old style spring (i'll be replacing that next).
Anoher thing I discovered ... not sure if it's relevant or not, on the inside of the original grip panels, there is a small circular symbol with "90" in the middle ... around the perimeter of the circle there are 12 lines, and tiny holes are drilled over 7 of those lines on one side, and 2 of those lines on the other side. At first I thought that "90" was the year, and the muber of holes was the month (i.e. July 1990) but couldn't understand why the dates would be different on each side.
Quoted: Call SIG and with the serial number they can nail it down for you.
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That'll be my next step if I can't figure it out here.