Other give away is I believe the 100TMX on the negative is code for 100TMax, which Kodak didn't come out with until long after the war. A period film from Kodak would likely be Panatomic X (a super low speed film) or in the field likely Verichrome, as IIRC Tri-X wasn't sold for 35mm still cameras until after the war even though it existed as movie film then. Good photo though.