Hi, I agree that you need to see the helmet first, some times you pick an item up and you just know its right. The stamp in the picture is the size mark. If you can look at it check out the liner, it should have a ink stamp on the inside canvas pocket. You do see these repainted during the war, different theater different shades, but check to see if any holes have been filled in, these were issued after the war with US liners in. I hope this is of some use. Regards Stanski