John Moore & Sons

For most of its history the firm's factory and main office was at 38-39 Clerkenwell Close, described in the 1850s as being 'situated in the very heart of the London watch and clock trade'.

[2] The firm then traded as Handley & Moore, producing their own clocks but also movements for other clockmakers such as John Grant senior, until 1820, when John Moore became sole proprietor after Benjamin died in 1819; by then, the business had moved to 38 Clerkenwell Close and in 1824 he expanded it into the adjacent building, No.

[1] A publicity pamphlet of 1877 claimed that the number of house clocks made by the firm to January of that year was 15,180.

[3] It also lists numerous turret clocks, installed over the years in cathedrals, churches and other public buildings across the U.K. and overseas.

Specialised clock movements were also produced, such as those designed to power the revolving lights or lenses of lighthouses and lightships.