[thecatspajamas]

David A, I think that's a pretty gross generalization to say that no photo can reliably be dated as to when the print was produced. There are plenty that are ambiguous to be sure, but if you see a news photo with original dated paper caption on the back that says, "Here's the boys in the game yesterday," you can be pretty sure of when the photo was taken and when that particular print was produced. That's not to say that you can assign a "Type" category to EVERY photographic print, but there are many that you can with a reasonable degree of certainty. For the ones you can't, you just can't, and you shouldn't try to or expect any TPA to be able to. That's when you fall back on more generic terminology, which in many cases is just as good.