I have a 669 and it's not my favorite compact 9mm, the 3913 is, but the 669 is nice for concealed carry during the winter. The grip is a little thick because it's a double stack, but it's short. It's a nice accurate shooter for the range. If you have larger hands, it's comfortable to shoot but my wife and daughter can't get their hands around the grip, so it's the gun my son and I shoot.
The previous poster mentioned the dates, and those are the same dates of production that I've seen. I got mine in '91 when I came back from Desert Storm (welcome home present). I will never sell or trade it off...
S&W 645, 3913, 59, 669