The mystery man in the Daguerreotype below, owned by Albert Kaplan, is indeed Abraham Lincoln, one of the most-photographed men of his time and certainly the possessor of one of history's most interesting faces. Mr. Kaplan's photograph has no provenance, unlike Meserve #1, which was owned by Lincoln's son. There's a fascinating forensic analysis online if you're interested in that sort of thing. Interestingly, Alphonse Bertillon, a French anthropologist who was a pioneer of fingerprint analysis for purposes of identification, spent a large portion of his life attempting to establish identity by body measurements and did a lot of foundational work in the forensic identification of photographs. We're now back to a version of the same thing once again with recent advances in facial identification software (which I personally don't believe will ever be absolutely practical, but that's a post for another day).
That would be fascinating. I would be eager to hear what he has to say. Please email me directly and I'll post your findings to the blog.