I have a 1962 Izzy barrel trunnion that I hope to build up as a complete rifle some day . Now I don't know which type trunnion to use, the second or the third one.Wow, interesting(and Im very jealous ;-))
Yea, maybe they used the one third from the left around 1962.
BTW, yours has awesome full proofs on it compared to mine. Still glad I have it though!