Your right with your comments smiddl. It does look a nice paint job. Forks are B1/B2. Everything else is common or shouts B3. It doesn’t massively matter as long as your happy with her. If you check the specification page you will be able to check exactly what model frame and engine you have.
@JP – It looks like a standard seat base that’s been recovered. are you in need of a seat? If so which model of twin do you have?