Type 42

The Celestial Intervention Agency believed that the War Chief had fled from Gallifrey in a stolen Type 42 TARDIS. (PROSE: CIA File Extracts) Some accounts suggested that this TARDIS had been one of the only two that had ever been stolen, up until around the time of the Second Doctor's trial: the Master's first TARDIS. (PROSE: Doctor Who and the War Games, Doctor Who and the Doomsday Weapon) However, according to other accounts, the Master's original TARDIS was a Type 45. (PROSE: The Dark Path)