I’m thinking that may be the kind of angle finder I want to get from my brother. As to a straight on pic, it was a bit hard to discern without moving my head back and forth because of perspective. Setup is all taken down, but it was obvious that the green frame was more relaxed.
Reading on the custom British builders of this time mentioned that many liked 72 degree parallel frames which would possibly match the green frame if the International did indeed have 73 degree as is often mentioned. The surprise was the chrome one actually looking slightly steeper at the headtube. Indeed , that one measured 1/8” longer in the top tube despite being 1/2” shorter in the seat tube. I find all this geometry stuff to be interesting even though I ride slow enough that it isn’t a big deal. I kinda like the low trail handling too.