Both Damascus and Sheffield have become rather general terms.
Many think Damascus is a superior steel. Modern day Damascus is simply layers of different metals forge welded, folded, and etched. It can be good or bad depending on what metals are used and the skill of the person who made it. There is a lot of cheap Damascus coming from India that is made from junk metal.
Many think that Sheffield was a cutlery company since blades were often stamped with the “Sheffield” mark. The mark is really a reference to the area which became the cutlery manufacturing center of the world in the 17th and 18th centuries with hundreds of cutlery manufactures located in the region.
Sheffield's location with a number of fast-flowing rivers and streams surrounded by hills containing raw materials such as coal and iron ore, and millstone grit for grindstones—made it an ideal place for water-powered industries to develop. Water wheels were often built for the milling of corn, but many were converted to the manufacture of blades.
As early as the 14th century Sheffield was noted for the production of knives. By 1600 Sheffield was the main centre of cutlery production in England outside of London.
There are over 300 master cutlers listed in Sheffields directories between 1624 and 1925. By 1910 there were over 4000 cutlery companies in Sheffield. Thousands of Sheffield Bowies Knives were imported in to the US in the 1800s.
There are still about 100 cutlery companies in Sheffield and although most are small and family- run.