Bernard Rudkin Hennessy was the son of an Irishman who opened a small academy in Swansea in 1840. He was apprenticed to a John Jenkins and opened his own business in Wind Street, Swansea, in 1848. He continued trading until his retirement in 1875.
The high count train on this regulator employs 24 leaf pinions throughout. The count is: Great wheel - 288; Second wheel - 192 pinion 24; third wheel - 180 pinion 24; Escape wheel 30 pinion 24. The minute is 68:68, the hour is 12:144.