At The Tone, The Time Will Be -

Wiki:

Ruth Belville (1852/1853-1943), also known as the Greenwich Time Lady, was a businesswoman from London. She, her mother Maria, and her father John Henry, sold people the time. This was done by setting a watch to Greenwich Mean Time, as shown by the Greenwich clock, and then selling people the time by letting them look at their watch.

Ruth Belville's father, John Henry Belville, created a service for 200 clients in 1836. Each morning, John Henry went to Greenwich Observatory, where he worked, and set his watch to Greenwich Mean Time. He would then set off in his buggy and would set the clocks correctly for clients subscribed to the service.

John Henry continued this service up until his death in 1856. His widow, Maria, took over the business and continued the business until her retirement in 1892, when she was in her eighties. Ruth Belville then took over the business. She continued the business up until 1940, by which time World War Two had started. Belville was in her eighties when she retired. She died at the age of 90.

The watch used by the business was a John Arnold pocket chronometer No. 485/786, nicknamed "Arnold". It was originally made for the Duke of Sussex and had a gold case. When it was given to John Henry, he changed the case to silver because he was worried thieves might steal a gold watch. When Ruth died, the watch was left to the London Clockmakers' Company.

Belville's business came under attack from St John Wynne, a director of the Standard Time Company, which sold a telegraphic time signal service and was therefore Belville's main competitor. Wynne made a speech at the city United Wards Club attacking Belville, claiming, "that her [Belville's] methods were amusingly out of date," he also implied that she might have been using her femininity to gain business."

The speech was published in The Times newspaper, but the article did not mention the Standard Time Company and the fact that he was Belville's competitor. Following the publication of the comments, Belville was besieged by reporters interested in her business and also the possible scandal, which was implied by Wynne's comments. However, Belville managed to cope, and the resulting publicity resulted in an increase in sales. Belville said that all Wynne had managed to do was to give her free advertising.