This would be a 12 ga. BPS (Hunter model) pump shotgun made in 1984
Check Browning's web site for how to decipher the sn.
No such model number as a shotgun
With the serial number that you provided,your Winchester model 1897 pump action shotgun was the 176th shotgun made in the year 1945.
Your serial number indicates that your Winchester model 12 shotgun was made in the year 1949.
100-350
It was made in 1957
With the serial number that you have provided,your Winchester model 1912 pump action shotgun was made in the year 1956.
Your Stevens shotgun was produced from 1978-1985.
1937
1961
With the serial number that you have supplied,your Winchester model 12 shotgun was made in the year 1913.
With the serial number that you have supplied,your Winchester model 50 shotgun was made in the year 1956.