Hello , S&W lovers
Please identify. What model and year of production , . 38 special , 6-inch barrel , number K 297112 on the Butt of the gun. Revolver shoots well but there were sporadic problems with firing, especially in DA ... weak spring?

Please identify. What model and year of production , . 38 special , 6-inch barrel , number K 297112 on the Butt of the gun. Revolver shoots well but there were sporadic problems with firing, especially in DA ... weak spring?