I campaigned this at meetings around the Waikato and BOP during the 79-80 season (or thereabouts). I picked it up off my best mate who was/is a friend of Peter Ploen. This was Ploen's championship winning RM370A, which he had upgraded with B swing arm and shocks, B fork internals and B ignition. The tank still had the sponsors sign-writing on it as you can see.
The seat is off an RM125 (which always fooled a few people), and I had the front seat mount raised a couple of cm's. The bars were some solid alloy things that were a bit of a fashion at the time.
Probably my favorite bike of all time - and I've had a few. Fast and great handling and steering.
Wish I still had it. My mate tells me it is still in the BOP area and being used.