WW1 Kensington War Hospital Supply Depot workers badge

A scarce original First World War period 'Kensington War Hospital Supply Depot war service pin badge'; silver plated title circlet inlaid with blue enamel, bold red 'streak of lightening' to voided centre, the reverse impressed with maker's details 'Thomas Bolton'. Very good condition, complete with original pin fittings, no damage to the enamel. Diameter 25mm.