One of my camera's is a whole plate National made by W. Butcher & Son. What I till recently didn't know is that Butcher also made lenses or had lenses made for their brand.
I recently got a very big heavy (at least compared to the other lenses in my small collection) lens with their trade name on it: its a 12 x 10 Rapid Rectilinear, with very nice glass and even a big flange (I just measured 26 tpi with a diameter of 2.930 inch). Btw this one is for WHS - but came without any. I guess the focuslength is about 24 1/2 inch (about 621mm).

Any info on (these) Butcher lenses?