On the frame and the grip frame.
To answer the question we'll need to know more about this pistol. Is it a revolver or a semiauto? What model and caliber? I found a Colt frontier scout .22 with that serial number made in 1962.
the caliber is stamped on the gun.
1912
1871
2006
1911
1910
what model, caliber. ????????
Caliber should be on the barrel. SN's were not required until 1968
Early 1930s
What model .38?
No such S&W model number.