Edward Lear’s lithograph of the Ancient Gate of Alatri from Views in Rome and Its Environs. In a coloured version, under Lear’s supervision? I’m finding more and more of these lithographs in colour, so perhaps the book was sold in different versions.

For sale, with a watercolour by Samuel Prout through Invaluable. If I lived in the US I’d be sure to bid on this, the starting bid is quite interesting.