I think the price breakdown goes like this...
Forehand & Wadsworth British Bull-Dog - $100
Really cool weathered box - $1,275
Knowing they just screwed you by selling you expensive paper? Priceless!
In most of the sources I found researching the pistol, I came across a ton of sales info that I thought was for this pistol but wasn't. Most of the sources I found were for a Forehand & Wadsworth Bull-Dog, which is a smaller 32 caliber pistol. These were selling for anywhere from $50 to $250. This is the only reference I could find for the British Bull-Dog so I have no idea if the price is valid or astronomical.
Items 14-169 and 14-172 at this link are the more common variations.
http://mori.studionet.it/armi/atlas/118.htm