Actually after doing some research, the term "Buckwheat Cake" refers to Buckwheat pancakes, so the silver companies decided one needed a pancake or Buckwheat Cake Server as well as a Waffle Server (See December 26, 2009). This piece is very rare.
Shown in Beekman by Tiffany (9 1/4 inches)
Shown in Douvaine by Unger
Shown in Heritage by Reed and Barton
Shown in Olive by Tiffany (8 1/2 inches)