SKB, we've been through this before. Anything made before 1898 is not a firearm in the USA. You can put it in your luggage and bring it back and customs won't say a word. I did this with a hand-made old Baluch double shotgun - brought it all the way back from Quetta in my luggage passing through London. But can you get such a gun out of the UK?
By the way, per ATF you can't import reproductions either - it's just that the Pashtun made copies of Martini-Henry's are so good they can't tell the difference so they don't try.
