Last known picture of Abraham Lincoln

[Houmes]

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Thank you for such an excellent reply! I'm printing it out and keeping it in my research file. You made note the revenue stamps. In my thread asking whether the photo of the young lady is Annie Surratt ( and its not), a revenue stamp of the period is attached to the back, so at least that helps in dating it.
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Forgot to tell you: Meserve put his imprint on the back of some of his reprints, and not on others. And disreputable sellers and dealers may place a fake Meserve imprint on the back if they want to market it with that added appeal. In the older albumen images of Lincoln (invariably those printed after his death) a real or fake revenue stamp may be placed on the back of an image to increase the value and mislead the buyer.

Best book I've ever seen on evaluating old images: James M. Reilly's "Care and Identification of 19th-Century Photographic Prints" published by Eastman Kodak Co., 1986. Paperback, still available. Profusely illustrated.