bells. Originally made by Thwaites in 1756, the clock was rebuilt in 1815–16 by Benjamin Lewis Vulliamy, the clockmaker to King George III. Prior to the completion of the clock of Big Ben in 1859, the Horse Guards Clock was the main public clock in Westminster. A dark stain above the Roman number two on the clock face is supposed to mark the time of the execution of King Charles I in 1649, which took place in the roadway outside Horse Guards. The annual ceremony of Trooping the Colour commences when the Horse Guards Clock strikes eleven. Household Cavalry Museum The Household Cavalry Museum is the official museum of the Household Cavalry and is located in the Horse Guards. Visitors can view the horses in the 18th-century working stables through a glazed partition. Exhibits explain the training and history of the regiment and include ceremonial uniforms, regalia, royal standards, awards, musical instruments, horse furniture and silverware by Fabergé. Visitors to the museum are welcome to watch the afternoon inspection of the guards and horses that happens daily at 4 pm. This routine began in 1894 when Queen Victoria found the guards drinking and gambling in the afternoon instead of tending to their duty. She proclaimed that they would be punished by a four o'clock inspection daily for the next 100 years. This proclamation and punishment officially expired in 1994, but Queen Elizabeth II chose to continue the inspection out of respect for tradition. Ceremonial Every morning, the mounted King's Life Guard rides from Hyde Park Barracks in Knightsbridge, by way of Hyde Park Corner, Constitution Hill and The Mall, to take over guard duties in a ceremony at 11:00 am or 10:00 am on Sundays. The guard is usually provided by the Household Cavalry Mounted Regiment, which consists of a squadron from each of the Household Cavalry regiments; the Life Guards who wear red tunics and white helmet-plumes, and the Blues and Royals who wear blue tunics and red plumes. However, some other mounted units from Britain and other Commonwealth realms occasionally mount the guard; the King's Troop, Royal Horse Artillery and the Royal Canadian Mounted Police are examples. When the monarch is in London, the Guard consists of one officer and twelve other ranks including a trumpeter and standard bearer; known as a Long Guard. When the monarch is not in London, the Guard is reduced to two non-commissioned