Varmint,
From what I understand and have been told, Screaming Eagle Bows own the design of the Wolverine. They gave the design to Dave Windauer and Bob Morrison to make for them. Bob doesn't make the bows any more, and Dave makes very few of them and only on request. They're very rare bows.
I'm not sure how similar the Windauer Wolverines are to the Silvertip longbows. I'll be able to tell you after this weekend, as I'm going to stay with my cousin Andy (tradtusker). Andy's father has a 2 piece Silvertip longbow. I'll share next week on how similar I found them.
The unique thing about my Windauer Wolverine, is that it has serial number #1!
Nigel