Yes 1975 bike. The front unsprung weight was added by the person I bought it from who also restored it. He had an issue with it not running right on both cylinders, after a long and protracted diagnosis he found that the inner pipe on one side had rusted and collapsed partially blocking the pipe. He had the Stainless pipes made by a firm called Tubeform in the UK. I can’t and won’t take any credit for its condition apart from the cleaning and riding. The 75UK bike did have twin discs but they were smaller in diameter, a friend of mine bought one new in 75, I was jealous.