Prince did sign as "ToraTora"during some store signings in 1995. Hard to authenticate but it looks similar to a few others I've seen. I'm leaning to it being OK as I think the "Tora Tora" signature is likely to less well known to forgers and less appealing in any case - not knocking the signature but I think fans / collectors really want "Prince" or failing that "Love God" P '88 (or P +).
Is the booklet signed by the band members too? What is the provenance?
I have pictures of 4 Tora Tora signatures that are legit and this one is consistant with the one he did at Virgin record store in 1995. It's a bit sloppy but looks legit 2 me. Consistant with the right pencolor of that signing!