WW1 Cambridge Special Constable Police reserve low isuue numbered badge

A scarce original First World War period 'Cambridge Special Police badge'; nickel title circlet, the solid centre bearing crowned shields, one bearing the Arms of the Cambridge University and the other of the City in relief, the reverse impressed with maker's details 'Bliss Bros Birmingham' and very low official issue number '138'. Very good condition, complete with original buttonhole fitting.
Diameter 28mm.

Code: 61968