Some clues:
1. Mahogany, and all the screw slots line up. Only the British were THAT anal.
2. Ross lens has a slot for stops, and appears to be a rectilinear lens. Slots became popular after about 1860, lasted until mid 1880s. Rectilinear manufactured after 1865. Can't be Dag camera as that faded out in 1850s.
3. Double plate holders. Not used for wet plate--they did one plate at a time due to time constraints. That dates it after 1870-ish.
4. Double plate holders are an older style, probably predate 1890s.
5. Does the camera have a bellows between the two wooden sections? Surely does. Might be a finely made amateur landscape camera. What is the plate size? Looks like quarter plate or smaller.
My guess:
Quarter plate camera from 1870-1885, English, wet or dry plate. (Don't see any black staining on holders so more likely dry plate era.)
Kent in SD