Which of the following is NOT a variety of Sebrights?

Sebrights are a distinct breed of ornamental chickens known for their unique feather patterns and small size. The breed is categorized into two main varieties: Golden Sebrights and Silver Sebrights. Therefore, the correct choice refers to an option that does not pertain to the Sebright breed at all.

The Golden variety has beautiful golden feathers with black lacing, while the Silver variety features white feathers also adorned with black lacing. The Buff-Laced variety is known for its unique coloration but is not a recognized Sebright variety.

On the other hand, the Plymouth Rock is an entirely different breed of chicken, well recognized for its barred feather pattern, and does not belong to the Sebright family. This is why the Plymouth Rock is the option that does not fit within the Sebright varieties, making it the answer to the question.