Interesting you say that about the head-stock. It's one of the things to me that's the classic Wal "look", along with the body shape when you identify it. When you see The Pass video, when Geddy is playing the Mk I in shadow, the head-stock is so prominent and distinctive. I've always favored that head-stock, much like the Warwick puppy-ear look, and the Tobias Bass-clef look. There's others, like the OLD Ken Smith basses, Elric, amd the hideous Surine head-stocks, but again, the MkI and MkII 4-string Wal head-stocks are the bomb.
btw, does anyone know if this rumor is true? I heard, in the 90's (?) Wal showed up at some NAMM shows (or the like) and brought some mini-Wals that could actually be played in their booth. Any credence to that? Did Pete and Ian ever go to NAMM shows?