When I said "predates him" I meant material that has an authentication from someone else and a sales record prior to perhaps 2016. He got caught up in 2021 or so IIRC.
I thought I posted this already. If you look at the 1976 and this 2002 Heathen CD signed in Sweden you can see the same "o" at about the same angle and of the shape. I believe the red 1976 shown here is one of the first "Bo°" signatures. With great variation, (often the "B," "o" execution (1977-80) and/or the paraph as seen here) this style would continue until his death in 2016.