You have to look them up in the Standard Catalog of Smith and Wesson by Supica and Nahas or call S&W.
@ 1956
@1971
Your serial number dates your Smith and Wesson model 59 to the years 1977-1978.
Mid to late 60s
1952 give or take
1950-1969 for exact information, it is worth the price to get a factory letter from Smith & Wesson
Either late 1800s or early 1900s
The "Standard Catalog of Smith and Wesson" by Jim Supica
Need a detailed description of all markings. No such sn for the Model 38
You will need to call S&W to find out. Does not follow normal sn convention.
1992-1994
91-99