I've just compared the signature on my Wave Form. The Muir could
be right, the G is a different formation.
Your sig. also looks a lot neater than mine - perhaps written on a "production" piece he made, by somebody else in the Studio?
(This does look like something produced more than once.)
I can't photograph it, my OH is on holiday and it takes two arms to hold it upside down to reveal the mark.
You could write to him at his site to ask. Send him the pics.
I've heard he's very nice and friendly.