Analysis of information sources in references of the Wikipedia article "List of sandwiches" in English language version.
...the British are so particular about sandwiches that they use the word less than Americans do. In Britain, a sandwich is some filing between two slices of bread. Not a roll. Not a bagel. Not a baguette. Without sliced bread, it's not a sandwich. The American sandwich prototype is much like the British: savoury filings within two slices of bread. But American sandwiches are allowed to wander further from the prototype, because they interpret the 'bread' requirement more loosely. An American sandwich can be on a roll, on a bagel, on a bun, on a croissant, and at breakfast time, on an English muffin...
The brazen assemblage of hot pastrami, grilled knockwurst, melted Swiss and hot mustard on rye bread, curiously known in these parts as a "sailor sandwich" is, most likely, a true Richmond native. Carytown's New York Deli, established in 1929 and operating at its current location since 1934, bills itself as 'the birthplace of the sailor sandwich.'
