I have to oppertunity to purchase 3 smith and wessons model 15 pistoles they are all about 80 to 90 % condition for $950 to start off with they are all snub noses and in 38 special the model 15-4 serial is 30K83XX then other 2 just said model 15 serial # 6312XX and serial # S9707XX Any idea on the value or when these were made?