I have a J SBT. They are a interesting design and a neat gun.
Bill,
What other sbt guns do you have? I collect SBT as well. So far I have:

Baker 2 early octagon Elite,Sterling 1 late Sterling
LC Smith prototype
Parker SC
Fox J
Weston
Francotte
Early Flues Ithaca 4E
Charles Sparrow Young (this is a two shot forward pump repeater)
Browning Recoilless (get them while they are cheap)

I would like to find an Emil Flues SBT, Ljutic space gun and DM Lefever. There was a very nice unique SBT that had been made by somebody in California at the antique arms show a couple years ago,but the guy wanted more than I was willing to pay for it.
Ive been watching for a Fox since I saw you post on trapshooters. Shoot me an email so I can get ahold of you if I find one.
ross@berck.org

John,
I think Ansley was long gone by the time the SBT came out.