WW1 Territorial Force Imperial Service Volunteer uniform breast badge Lambourne & Co

A scarce original circa First World War period 'Imperial Service' die-cast nickel pin badge, worn on the uniform above right pocket by Territorial Force Soldiers who had Volunteered for Overseas Service during the Great War; the reverse impressed with maker's details 'Lambourne & Co Birmingham'. Very good condition, complete with its original substantial pin fittings.Width approx 43mm.