Rockdoc, it could be the same fellow. The Chicago Hasedll was trained early on in Britain and came to the U.S. in 1870 at about the age of 45. Curtis Johnson's second book, Gunmakers of Illinois has some bio on him as well as an 1881 challenge from L C Smith, Maker of the Baker Patent gun, to see whose guns patterned the tightest. Hasdell was supposed to prefer a "long taper choke" boring.
It is never clear with these fellows who operated on imported guns, exactly how much was done overseas and how much was done here. I have seen Hasdell guns both from England and Belgium. Quality varies. The gun we are talking about seems fairly high quality and I would guess most of the work was done in Belgium.
