I just got a mystery roll of film, which seems to be Kodak made B&W. The Bar code on the Cassette is 010764. the trailing 4 indicates a 36 expsosure roll of course, and the first digit is a "do not care", so the middle 4 digits are the film type. it is not the same stuff as Arista 400 as that has a code of x1029x. Both the base and the emulsion are much darker in colour than Tri-X. It came in a clear and grey Kodak style can, and the package says made in USA packaged in Mexico. The leader has a little notch the same as other Kodak made films.
I don't have any Tmax 400 to compare, so I was wondering if any of you have a loose roll that you could check the numbers printed under the bar code on the cassette?