At the Track site, there is a 12 bore/.45/70 listed for $999.00 US - that would be around 475 to 500 pounds, I guess. It is stamped on the rib, WR then the gauge and calibre. It has 1 or 2 leaves to the rear sight, with back action locks.
site is : www.trackofthewolf.com upon clicking on the link given, the shotgun/rifle comes up below the header. It will also be in the 'firearms for sale' section.