The original serial number of Rolls-Royce Silver Charm is 40/50HP, and its chassis was originally produced by Rolls-Royce's factory in Manchester. It was produced in Derby 1908 and then in Springfield, Massachusetts 192 1 to 1926. Among them, the car with chassis number 6055 1 and registration number AX20 1 was later called "Silver Ghost", that is, the source of 40/50HP was called Silver Ghost. However, the factory did not recognize this name. It was not until 1925 that Phantom I was put into production that the factory officially called the 40/50HP car series "Silver Charm".

1906- 1926 during the past 20 years, the total production of India and the United States was 7874 vehicles. It was replaced by the first generation phantom after the production was stopped.

It is because of its charm that Rolls-Royce is called the best car in the world-this is not the slogan of Rolls-Royce itself, but what Autocar magazine said in 1907.