100-5000 USD depending on EXACTLY what configuration you have, condition, box, accessories, papers, history, etc..
100-800 usd
The smith and wesson model 18-3 was made from 1967-1976.
100-500 USD and up depending on specifics
Your serial number indicates that your Smith and Wesson model 18 was made in the year 1962.
1960; 20-1000 usd
I can say that the Smith and Wesson model 18-3 was made from 1967-1976.
1965; 50-600 usd
60 - 675 usd
Model 18-2's were made from 1961-1967 The sn you list dates to 1973. You might want to recheck the sn.
Try e-gunparts.com
100-5000 USD
@ 1962