In defense of Townline (and trash-panda if they actually work for them), some hatcheries are pretty......lets say......liberal on their definitions. This is the list that McMurray claims represents....as they call it, the "Rarest of the Rare" for one of the hatching egg assortments they sell.
"Sumatras, Dominiques, Golden Laced Wyandottes, Silver, Golden, Buff Laced, and White Polish, Golden Campines, Golden Penciled Hamburgs, Silver Penciled Rocks, Partridge, Black, Buff, Blue, & Silver Laced and White Cochins, Araucanas, Dark and Buff Brahmas, Phoenix, Fayoumis, Salmon Faverolles, W. L. Red Cornish, Lakenvelders, Black and White Langshans, Red Caps, Silver Leghorns, Silver Gray Dorkings, Old English Games, Sultans, Buttercups, & Spanish".
I would say less than half of those are even remotely rare....