If you call S&W they will tell you when it left the factory. It could have been made weeks or years before that.
When was 38 smith and Wesson serial number 172095
1980.
That serial number requires a call to S&W
Your Smith and Wesson model 19 was made in the year 1978 by the serial number that you have supplied.
1974
@1972
75-76
@ 61
Need the serial number
@ 1962
Mid 40s or so
1980