MB110198 GB National Dock Labour Board Ambulance Centre bronze 15 years long service medal

GB National Dock Labour Board Ambulance Centre bronze 15 years long service medal. Struck bronze 57mm. Style post WII. Set up in 1947 after the Dock Strike of 1945, the NDLB was abolished in the 1980s so dates from 1963 onwards. Reverse has a Maltese cross as the badge of St John Ambulance