No, the top lever is marked " TR Hasdell Maker, Chicago ILL"

I also looked up his name in "British Gunmakers VOL 1 London" and he is listed in the "Alphabetical List of all London Gunmakers and related Trades" as having been on 150 St John St Rd 1862-66.

So, I can assume he did quite a bit more than just inport the gun. Just what he did do is still a mystery to me, but I can assume it had to do with finishing the gun.