From the earliest years of the 20th century Daimler were invariably chosen as the monarch's state cars until the accession of Elizabeth II in 1952. (Several of her predecessors' Daimlers are now on display at the royal motor museum, Sandringham House). As Princess Elizabeth she was already the owner of the above-mentioned 1950 Rolls-Royce Phantom IV, and this became the No.1 State Car on her accession (alongside which her father's Daimler DE 36 state limousines continued to be used through the 1950s). During the same decade, other potential state limousines were built speculatively and made available to the Royal Mews, both by Rolls-Royce (a 1954 Phantom IV landaulet) and by Daimler (a pair of DK400s). By 1959, the decision had been taken by the royal household not only to purchase the 1954 Rolls-Royce, but also to order two new (Phantom V) cars, which would continue in use through the second half of the century.