What's the reason for the question? Then maybe there's an answer that'll make sense.
The only A-2's in the 40's with two piece backs were from Hollywood's wardrobe dept's. Or maybe you saw an old "A-2 style" jacket for civilian use.
Haha, No it's no test or trick question. I know this will sound rediculous to most of you but I'm trying to disprove a claim that the jacket used by Harrison Ford's stunt man in the famous "under the truck" scene (in Raiders) was a modified A2. There is a certain party that has written a very well accepted article that states that this particular jacket in question was made by Wilson leather and was nothing more than a period correct A2 that had been modified with the removal of knits, and it had no back detail. So I can obviously point out that the back yolk was not a period correct detail of A2s (I honestly wasn't sure but I thought most if not all just had 1 piece backs) and the yolk can certainly be seen in screne caps. Not to mention the vent pleats that are there, like all other indy jackets. I know - I'm an Indy Nutter. Thanks for the info.