your Remington model 6 was made in 1998,due to the S prefix on the serial#.
1919
Manufactured 1931
1928, will be date code stamped. check link on Remington Society.
These where manufactured from 1981-1987. If in 90% condition then about $300.
January 6 1902-43,897 were made
1923 - will be date code stamped, see related links
August 1928, thought I would have suspect 1929....
Early 1928, see related links for date code stamp.
1930 - it's date code stamped on the barrel see related links for information on the Remington Society of America.
Check the date code stamped on the barrel. Remington Society of America, Manufactured Date link has the details.
Most people say that they are fake. But yes, I have seen a real modol 6 sioiux 498000