[T Billigen]

That last letter looks like a restamp, I think those numbers were in a gang stamp and should all be the same? I have seen some different size stamps on 409 pads but they were hand stamped and used a 1/4 inch stamp for "F" for flint cars, where the rest of the letters and numbers were3/16. What are these numbers in the photo from? But I guess anything is possible. I have seen pictures of blocks with part of the casting number ground off and different numbers stamped on at the factory!