I bought mine (536.270112) new at Sears in about 2000
First 6 digits of the serial number is: month, day, year. For instance: S/N 031104D001144 was manufactured: march 11, 2004
2000
The earliest year is 1954.
Your Craftsman GT3000 was manufactured in 2001.
I do not know what year my model 917.270930 lawn mower was built
1998
1997
2006
2004
1995
It would probably be 2002-2004
The serial # will usually give you the year.
March 01 2004
1914.