Dalek Supreme Type A

A distinct model of Dalek casing was identified by the Time Lords (PROSE: Dalek Combat Training Manual) as being used by the Dalek Supreme who oversaw the Mechonoid Incident as well as the Daleks' master plan leading to the Time Destructor Incident. (TV: The Chase, Mission to the Unknown, The Daleks' Master Plan)

Characteristics
By the time it ordered the execution of the First Doctor, the Black Dalek Leader operated a predominantly black casing with a silver middle section now with slats and blue sense globes like its silver Dalek subordinates. (TV: The Chase) Similarly, a bronze-type Imperial Guard Dalek in the aftermath of the Time War was predominantly black with a bronze middle section. (TV: The Parting of the Ways)

Behind the scenes
The prop for the Black Dalek seen in The Chase, Mission to the Unknown and The Daleks' Master Plan the same prop as used for the Black Dalek in The Dalek Invasion of Earth, which was used earlier in the same serial for the saucer commander, and one of the four originally constructed for use in The Daleks.