I will dig through my Waterlow material this weekend to see if I can find my list of engravers and see if I can shed any light. Gene Hessler lists in his book "The International Engravers Line", the following engravers for Waterlows: Bain, Harold J. Bard, Herbert Bourne, Harry Gilbert Carradine, Edward Dawson, Ernest Edward Dickenson, Edmund Dulac, George R. Fairweather, John Augustus Charles Harrison, Thomas Samuel Harrison, Charles Henry Jeens, Joseph Lawrence Keen, Richard Loxley and J Sanchez Toda. There are some great photos in the book and I will see if I can scan them over the next couple of days and post them. He also lists a Hugh Wilson as the engraver for the 1864 issues of the Clydesdale Banking Company in Scotland. Possibly a relation?