Excerpted from Niel's Strazors:
Meanwhile, in 1859 his brother John Newton launched a new electro-plate and cutlery business, Mappin & Co, at The Royal Cutlery Works in Pond Hill.
~Richard
Very interesting that you bring that up. I have the distinct impression that the incredible finish on my Mappin is nickel plating.
I'm sure it's plated, here is a pic of a square piece fallen off. Microscope shows sharp edges of a coating on the blade.