Grey Dalek Type B

A distinct "shade" of grey Dalek casing was the second of three identified by the Time Lords. (PROSE: Dalek Combat Training Manual) Dalek drones of this casing type served in the retrieval of Davros from Skaro during the Dalek-Movellan War. (TV: Destiny of the Daleks)

Behind the scenes
The Doctor Who Technical Manual (1983) identifies the Daleks of Destiny of the Daleks as the "Type V", following the "Type I" and the "Type III".