You will have to call S&W with the serial number to find out.
When was 38 smith and Wesson serial number 172095
Smith and Wesson is the make.
Standard Catalog of Smith and Wesson
Your serial number was used by Smith and Wesson for the models 10,12,13,45,64,65,547.It dates this serial number to the year 1979.
K 7981 smith&wesson
Standard Catalog of Smith and Wesson by Supica and Nahas
What serial?
The Standard Catalog of Smith and Wesson, 3rd Edition by Supica and Nahas has serial number data that will assist you.
email the serial# to smith & Wesson and they will respond with the date
Email smith and Wesson for the answer
Call Smith and Wesson with the serial number and the will tell you.
Standard Catalog of Smith and Wesson, 3rd ed.