This guy was originally released with the 7th Doctor in a cream colored jacket, hat, and smile. I never got that one, instead getting the figure with the darker jacket and the TARDIS. Of course then they released what I consider to be the definitive version in the 11 Doctors box set, so yeah, I kinda dropped the ball there.
This white and gold design only appeared in the serial "Remembrance of the Daleks" and was one of 2 warring Dalek factions. The Imperial Daleks were made by Davros after the original Daleks turned on him. They have never appeared since.
This guy is actually being released in a box set of 4 Dalek Designs from "Remembrance" and damn do I want that one. Although mostly for the heavy weapons Dalek. (A Dalek with no eye stalk and only a big giant cannon on its "chest.")