Norwich City Special Constable police reserve badge

A very scarce original circa First World War period 'City of Norwich Special Constable lapel badge', Crowned gilt brass blue enamel title strap, the centre bearing 'Norwich City Coat of Arms' (a Castle over a Lion passant guardant), the reverse hand engraved with the numerals. Very good condition, complete with original buttonhole fitting, no major damage to the enamel a few minor scuffs. Height 36mm.