The Dunking Cup and its saucer was modeled in August 1940 by John Berrisford under the direction of Frederick Rhead. The cup was made with an oval opening to allow the dunking of the doughnut into coffee. The figure 8 saucer had an indention on one side for the cup. The other side was given a raised center to hold the doughnut.
The only example known to exist is the set shown below which is part of the collection of The Fiesta® Tableware Company. The saucer isn't marked, but the cup has "Dunking Cup, Pat. App. For" embossed on the bottom.