Destry, Are you looking for an English gun? You might try Diggory Hadoke at Vintage Guns in London. Very realistic and knowledgable fellow. He is keeping an eye open for me and a Purdey 12ga with hammers and back lock.
Take care,
Neill

I'm looking for an English gun, but it's one that was "made for the trade" here in the US so I doubt there's too many over there. It's a W. C. Scott model called a Bogardus Club Gun.

Destry