Castletown, Isle of Man

[Ted Steele]

On holiday in the Isle of Man I saw several bells of interest and, with 
one exception I have since found out all I wished to know about them 
from the National Bell Register. The bell that hangs in the clock-tower 
of Castle Rushen in Castletown is marked simply Earl of Derby 1729; the 
other side seems to have simple ornament and no further inscription is 
visible. The castle was the seat of the earls of Derby in their capacity 
as Lords of Mann so presumably provided this bell and I have read that 
the date is regarded also as the date of the clock-tower itself. Can 
anyone tell me any more about this bell please?

Ted