Aermore Exhaust Whistle

Going to an auction tomorrow in Greeley that has one on it. Has anyone ever see one sell? I looked on the internet a bit and everything I found for them was on model A's and such but this one has a way different valve setup. Thinking it would look pretty cool on my TC MTA with the 40" duals.
http://www.k-wauctions.com/Dill%20Pictures%20Page%206.htm

Got it bought came with another butterfly valve which is the hard part to find. Its a 4 chime number 2.

cool--what does something like that bring???

I had to give $175 for all of it and mine are nickel plated not brass.