WW1 Speed Up Munition 1918 silver winged bullet on war service badge

A very rare First World War official War Workers hollow silver winged bullet badge, the reverse bearing Chester silver hallmarks for 1918 and Patent number "Rd151360" a Registered Design date of 1890. Good condition, original pin fittings replacement pin, service wear to the enamel, scroll detached right side, no dents or distortions.
Width 30mm.
Height 28mm.

Code: 52627