As CG said, it's late 80's build, it's a similar build to what they were making in the late 70's. It's kind of sad for me as these were the factories last gasp to survive. :'(
I have ridden one & they are a nice bike, should in all fairness be allowed to race pre-1980. Pretty much the final evolution of that motor, centre port barrel, "Jikuni" carb, unsure if it's electronic ignition. The forks are possibly Russian build as someone once pointed out they have a hammer & sickle stamp somewhere, good looking triple clamps too. The hubs are different to earlier models which had cast magnesium conical hubs.
Your own Mr Drakeford I'm sure could tell you a lot more than I can.