You will have to call S&W with the sn to find out.
Standard Catalog of Smith and Wesson
1855
You will need to buy or find a copy of the Standard Catalog of Smith and Wesson.
1995
@ 1943
1972
1983-1988
@32 yrs old
27 years old
A shotgun made for Smith and Wesson, sold under the Smith and Wesson name.
Standard Catlaog of Smith and Wesson has sn data. Call S&W and they will tell you when it left the factory.
Your serial number indicates that your Smith and Wesson model 59 was made in the year 1975.