I still have the manual for mine, which has "copyright 1969, by the power tool institute.....". That may be a couple of years off, but I have had this saw since my teens....if that helps. My grandfather, who used to read and commit to memory all sorts of publications about tools, hardware, vehicles, etc. said that sears power tools were made by singer back in those days.....
The earliest year is 1954.
I do not know what year my model 917.270930 lawn mower was built
Your Craftsman GT3000 was manufactured in 2001.
1997
1998
2006
It was made in late 2001 for the 2002 model year
2004
1995
That would be a 1990 model,built for Sears by Murray/Noma
One online source gives the year as 1940.
1980