How can you tell if a photo is an original? 1915 Hans Lobert Photo

[packs]

I'm thinking these two photos were taken the same day too. Maybe in between warm up tosses? Which would be really fantastic because an original photo from Opening Day 1915 would be an incredible piece to own. The other photo that I posted is clearly a reprinted photo. Everything about it screams that it's been through a lot of copying, the dissolving of fine details and general shadowy nature of that particular print. Mine however, is very clear and even clearer than the close up scan I posted makes it seem. I've been doing some research online about early photography and from what I'm reading it seems as though the clearer the image, the more likely it is to at least come from the original negative, if not an original print. However, it's extremely hard to do any real investigating because me and my photo are 3,000 miles apart.

I'm going to try the sticky test next week when I return home. I wish I had a black light, but I do not. Can you tell me a little bit more about Albumen prints? Is 10 by 12 any indication of printing? Anything else you guys could tell me I should look for in the characteristics of the photo paper? All help and discussion has been greatly appreiciated. Thanks guys!