Development work on 10EX ended in late 1927, but three more experimentals were built with lighter bodies: 15EX, 16EX and 17EX. Meanwhile, 10EX was used by the company in liaison with the Air Ministry.
After its test career, it was frequently used as a works demonstrator car, and in fact, it was even used by the factory to visit the 1927 Schneider Trophy seaplane competition in Venice, which Rolls-Royce won in 1929 and 1931. This one-off vehicle is, in fact, the only experimental Phantom I to be kept by Rolls-Royce for several years after testing.
“The car is accompanied by a considerable dossier of records, photographs and correspondence relating to its history and restoration. This is certainly a magnificent, one-of-a-kind Rolls-Royce with unique provenance, to say the least. Without question, its offering marks an opportunity that may never again be repeated in one’s lifetime. Phantom I Rolls-Royces are sought-after in themselves. An experimental example with a remarkable history of cutting-edge testing by the factory is all the more special,” a statement from RM Auctions reads.
The first Rolls-Royce experimental car, chassis number 1EX, was a Silver Ghost test bed built in 1919. The latest, 102EX, is a battery-electric version of the current Phantom that wowed the crowds at the Geneva Auto Show this past March.