check the date code stamped on the barrel. Remington Society of America, Manufactured Date link has the details.
1912
1910
1911
1911
1908
Second year production 1906.
Post a serial or call Remington.
1916
1905
1926
I also have a model 11 with serial number 17xxx. Remington told me it was produced in 1905 the first year they were made.
1907 (late)