William Duffield
Maybe it's an old wives' tale, but I understand that Disston improved their metallurgy as time went on, and therefore newer saws, with regrettably less comfortable handles and made from cheaper wood, have the best steel for scrapers.

Note also that you can make small scrapers from bigger scrapers. To that end, I understand that Bahco and Lie-Nielsen scrapers are made from Swedish 1095 steel, while other (predominately English) brands are probably made from lesser steels, maybe 1085 or 1075. Of course they don't tell you what they use, but I have noticed that my Swedish scrapers tend to hold an edge and a burr longer than the others I have.