Cheers URX....Steve Harper made his pipe sets for collectors mostly, but then sold a few at country shows and fairs, along side the canes and pocket pistols.
The Griffin was actually made less than 20 miles from me and I still have a prototype of sorts of his, but never bought a Shotgun (don't know if I regret that?) As to the Rhino I think it was a CZ production as it was easier than the in-house production of the Predator, Brocock had a few different ideas, but they came quite late...
I'm trying to document all this...