WW2 British No.10 Delay Time Pencil Detonator

British Number Ten Delay Switch (official name, 'Switch, No. 10, Delay' and often referred to as a 'timing pencil' - The number ten delay switches and delays ranging from 10 mins to 24 hours - the time was denoted by a coloured safety strip. This is in great condition with green safety strip and accessory holder.