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Also, the top hatch and plate are cast, and the side walls are of a thinner non magnetic material.

Great point! I measured it and did the math, and you were correct it would come out to hold 203 lb of powder.....close enough! Thank you! So, any thoughts on why would be specifically stamped with John A Dahlgren's initials and 1858? I know he went on the Plymouth in 1857-58 in order to test...

Ok, so I've searched the internet to death. Learned a lot about WNY, John Dahlgren and guns.........but I still have no idea what this thing is!!!! Can anyone help please? Thanks! PS: The only thing you can't see in the pics is a mark reading "200 lbs" and a small stamped anchor symbol. All...