Mustaches flourished all throughout the Victorian years. Great gobs of wax were melted and then applied to the mustache to keep the curls intact... And here presented a problem when steaming hot cups of coffee or tea were carried up to the mouth for sipping. The steam from the beverage would melt the wax, sending it right into the cup.
Eventually, in 1830 an innovative Englishman named Harvey Adams made an unusual invention: "the mustache cup". The mustache cup has a ledge, called a mustache guard, to help prevent the precious facial hair of the generation. The guard has one semicircular opening against the side of the cup.