Yeah, 10 years before the 1st Ninja.
The JPN was a low production bike. Almost all were street legal 850's. They were expensive new, and still are. About $10K will still buy a nice one. These are actually a sheep in wolf's clothing. Lots of unique parts, and look the business, but no hotter engine than a stock Commando. The earlier 750 Production Racer (from about '70-'71) was the real deal.
Years ago, I lusted after one of these. My Dad was friends w/ a doctor who had a '74 JPN and a '73 Triumph Hurricane. Fast forward about 15 years, and I got to put some miles on a JPN. A friend of mine has a cherry JPN, but his wife wanted to go on a ride. His is a solo seater, so we switched bikes for the day. Very uncomfortable riding position and limited steering lock. Looks to kill, but I lost the burning desire.