Frank Holden patented his design for the electric clock in 1909. The clocks were in all probability manufactured in France and carried the signatures of Rebesi, Regina or Apollo.
In 1923 he produced a further design with a horizontal balance wheel
There is a brief reference to the work of Frank Holden in Hope Jones' book "Electrical Timekeeping". There is also a descriptive page in the Science Museum Catalogue of the "Electrifying Time" exhibition.