Two places. On the very bottom of the butt itself, or stamped on the frame where you must open the cylendar release first.
Check on the butt.
Impossible to answer without the serial number.
100-450 or so
25-450 usd
Feb.1984 with the serial number that you have provided.
@1984
1956-1957
1974
@ 1970
50-600 usd
The Standard Catalog of Smith and Wesson, 3rd Edition, by Supica and Nahas.
1980