I'm under the impression a lot of the parts(most) from the "production" RH and RN's could be found on the works bikes from that time. The bike in the Good collection, apparently found in a sad state in the UK,is said to be the real deal. This bike; (it's engine ,frame,forks and assorted bits); looks identical to mine. While they are a completely different bike to the TM, I can't imagine they made new moulds etc to cast up engine cases and the like for the RH/RN that weren't also used on the "works" bikes. While I don't know for sure and certain, I would like to think ( probably wishful) that when the decision was made at HQ to do a limited run of production "works" bikes that they didn't start from scratch but borrowed from the already existing specs of the works bikes. I think they have more in common with the works bikes than most people think.