No labels, nice and light, spear point lugs, heart cut outs. I think by the weight and style it will be 531. Not sure whether I strip clean and rebuild or do I go complete and refurb the paint and decals. Questions, questions, questions ?What sort of era is this machine? The lugwork looks quite delicate, i.e. thin material rather than chunky. I'm assuming the frame is 531? I never cease to be surprised how much old lugged steel machinery there is still lurking out there.