I think its a 73 based on the tail design made for towing. I'm not clear on that but it was pre 74, when they changed engines. Its rare and from what I can tell the only reason the tranny is locked up is because the chain is rusted. So it just needs a carb cleaning and some air in the tires, and 2 new chains and some oil. Bikes a beast for sure.
I dont know if you are serious about the trade, what would you ride, the rokon aint exactly a street bike. You'd still be required to hang out with Mike and I if ya traded.