This is one of those little surprises that you don't find in shops usually, a CD 315 [020] PRISM. This guy was neatly tucked away in the back of a deep china cabinet in a dark room. I was just walking out the door to leave when I mentioned the word "insulators" to my dad and the shop owner overheard and called me over to show me this one. What a chance find! Ask and ye might receive!