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Do you mean the part that flares out behind the hammer? I saw a 1920 model that was very rounded there but the '61 I just bought and post 64s I've seen photos of show a very sharp flare or 'wing'.
The tang is wider on a post 64 Winchester. I don't know the cut-off date exactly when things changed, I just know a post-64 will not fit a pre-64 precisely.