Last picture.
Contact me by PM if you would like the sellers contact info.

David,

Thanks for the Elsie photos! PM sent.

The J. Manton 8 gauge was likely made inn Belgium and proofed in Birmingham as was the practice at the time. Manton and Co. marked guns were British and among the finest of the flintlock era.

From: http://thedales.org.uk/joseph-manton-shotgun-maker/

From SHOT-GUNS their History and Development – by Major Hugh B.C. Pollard 1925

"The best British makers towards the end of the eighteenth century were Egg and Twigg, but they were rapidly surpassed by the genius Joseph Manton, who was born in 1764 and died bankrupt in 1835, after an amazing career in which expensive litigation absorbed all his profits."

Ithaca 10ga
 

The same seller has this Ithaca 10 $500.

Those are some fine 10 bores ! ive seen only a few 10 ga on 8 ga frames , its been awhile though . And like Charlie said just about any 8 gauge will sale for a good price .

would be tempting to turn that 10 ga into a eight ga. charlie

It amazes me how little flues go for. I think Rodney Dangerfield would say "the flues gets no respect, no respect at all."
Mark if you get the elsie your going to post more pictures for us right.

Charlie brad B is going to be boring 10 ga with enough wall thickness to 8 ga so its possible . though id only do that with one of those Spanish 10 bores .

Eldon http://www.gunbroker.com/Auction/Vie...Item=407461216

this one looks really heavy http://www.gunbroker.com/Auction/Vie...Item=406899654