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Your Winchester model 1897 shotgun was made by Winchester in 1909.
No such sn for the Model 1897
Winchester Model 1897 serial number 403969 was manufactured in the early part of the year 1908.
With the serial number that you provided,your Winchester model 1897 pump action shotgun was made by Winchester in 1924.
It was built in 1922.
1903
With the serial number that you provided,your Winchester model 1897 pump action shotgun was produced in the year 1914.
This fine old shotgun was made in 1902.
Made in 1909
Manufactured in 1897.
Proofhouse.com has sn data
Made in 1905.