The frame itself has value as well, the print would need to be looked at and compared to other paper from 1860s/1870s. Not seeing it in person is tough to evaluate, not sure of the size or anything. I have seen many engravings and lithographs just cut and framed from books - so do a bit of research first. Match the paper from an old book, if the paper is thicker and is stronger than maybe you have something specific that the frame could have been created for. This certainly would give you more value than just a cut from the book, see how it fits within the frame and how the paper was cut. Good luck!
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