U.S. Military Automatic Rifle: Johnson:


Johnson semi-automatic rifles were manufactured between 1941 and 1944.
Serial numbers with no letter prefix and with prefix A and B were manufactured in 1941.
Serial numbers with letter prefix C, D, E and F were manufactured in 1942.
Serial numbers with letter prefix G were were manufactured in 1943.
Serial numbers with letter prefix H were manufactured in 1944.