Sonny wrote in news: snipped-for-privacy@googlegroups.com:
OK, I see confusion coming here. As far as I know, there is no "Sheffield (the man)". Sheffield is a city in England where the crucible steel process was invented, which produces a steel particularly well suited for tools, knives, and similar things. Up until the early 1900's Sheffield steel was the best for those things, and a Sheffield makers mark was an indication of the quality. The word "Sheffield" should be taken as more of an indication of the material used than the place of manufacture.
Note that "Made in Sheffield" is not a makers mark. A makers mark would (typically) have the name of the maker, or, for the better known makers their logo, and the word "Sheffield" - no "Made in". It may also say "Made in England", altho most don't. If it's a tool it's likely to say "Cast Steel" somewhere (cutlery often says "Stainless", silver and plate usually have proof marks).
There is a modern brand called "Sheffield". I have no idea where or by who they are made. They are Home Depot level of cost and quality.
John