Sorry about the ****** pic, but here's mine. My brother has one also.






I need to try and get some better pics someday. All the early production have the serial number prefix CEN and were marked TESTED FOR +P+. After about a year and a half or two Smith started using whatever the then current serial number prefixes were and stopped marking them for +P+. As I read on here awhile back they realized that they could maybe get themselves in trouble stamping that authorization on there so deleted it.
I've had some other 640s over the years but this is the only CEN one I've ever had. The 640 is my all time favorite Smith and I will get another one or two someday.
Oh, and the action on mine and my brother's is just amazing for a factory standard production revolver. We've both replaced the factory smooth wood grips with UM rubber grips.