A link to the manufacture date tables by serial can be found on the Remington Society of America on this page. http://www.remingtonsociety.com/rsa/questions/barrelcodes
1942
Depends on the model.
Remington Works - 1914 (late)
your Remington model 6 was made in 1998,due to the S prefix on the serial#.
1914
1913
1920
1919
1920
1915
1912
1920
1923