Published serial numbers only go to 1985 up to serial number starting at T34453, so I would have to guess your Pyhton would be 1988 or 1989. That's about as close as I can get. They made 27,541 Pythons in 1983, but only 6912 in 1984 and 1985 starts with serial number T34453, so who knows how they were spaced over the next couple years. Sorry! You could call Colt and they may tell you.