In my opinion it’s a toss up between an A2 and a B-3. I think they were the most photographed jackets of WWII. That’s not to mean I’m not a fan of the Irvin but there were so many more A2 and B-3 jackets made during the war than any other type of jacket and I think when people speak about or think about a “Bomber Jacket” these are the first two that come to mind. At least that’s here in the US. Once again just my opinion.