"Hi Henry, The Ross lens dates to late 1870s (see Jason Motamedi's site amongst others http://bit.ly/2dvHSsN).
As to what it is, what is the f-stop? From the photo perhaps it is a Rapid Symmetrical - you'll need to post some closer photos…"
If you ask Ivan Roseman he might be willing to make you a Kinnear replica in the same format that Thomson used for a reasonable price. You can find him on flickr, username "Roseman's" https://goo.gl/W4HLbu
"That's exactly right. The dried collodion becomes impervious to the developer. In dry collodion the prepared wet plate is put into a bath containing tannic acid (Russell's process) which might also contain honey, or a bath of beer and…"
There might well be interest in the UK collodion community - Tony Richards in Manchester for example. Someone might well buy it as a studio camera for wet-plate. If you drop him a line (www.fourtoes.co.uk) he might be able to help by offering…"