International used the late style follower assembly. The front of the assembly usually has a letter code if the
rifle was manufactured after late 1953. Earlier rifles could have letter coded followers. The letter code would
be A,B,C, or D. Letters higher than these would be used later production.
Early International follower assembies aren't letter coded but do have the notches on the ribs. The red arrow is
pointing to the notches. These notches are present on the early letter coded parts A, B, C, and D. I have also
observed the notches on a few very late parts marked with a larger stamped letter L.