For sale is this vintage single egg cup manufactured in the USA by Homer Laughlin, the maker of Fiesta as  part of its Harlequin line of dishes and tableware.  Harlequin single egg cups do not seem to have been produced in as large a quantity as the large double egg cup, and one in the maroon (dark red) glaze seems to be even harder to find.

This item is in a very nice condition and would be a great addition to the collection of any fan or serious collector of Harlequin.  There are no chips or cracks. There is one faint, tiny glaze skip on the inside that I have shown in a photo.  The glaze is a little lighter around the top rim and base, as is the Homer Laughlin way.