Eiji -
Awesome shots of the Turners! I really have to make a bigger effort to dig mine out. One of mine is what is now called a Model Two (two pickup), another is a Model One and the third is a Model One which has had an EMG pickup added at the bridge. The Model Two pickup selector is definitely interesting, although it makes more sense on the guitar than the bass (it's not often you'd want the out-of-phase sound).
Eiji didn't mention the very unusual parametric EQ on these instruments. When it's on, there's a sweepable notch filter with a very sharp peak. When you turn the knobs, it's even more like a wah pedal than the Series bass EQ.
I have two of these 80's Turner guitars as well. One is a Model Two which is like the two pickup version of the Lindsay Buckingham guitar. When you rotate the neck pickup sideways and tweak the EQ, it sounds like an amplified acoustic guitar. The present-day Turner Ones can be outfitted with a piezo bridge, but these old ones don't have it. These guitars are relatively plentiful compared to the basses - I remember reading that there were nearly 200 of these.
The other one I have is really odd and I don't believe was ever in regular production. It's a double cutaway with the curved body and a pickguard (not as fancy as the Model One or Two), but the really odd thing about it is that it has 27 frets.
David Fung