WW2 Dennis Brothers Ltd commercial vehicles National Service ID badge

A scarce original Second World War 'Dennis Brothers Limited war service numbered identification badge'; chromium plated example inlaid with blue enamel bearing the very distinct logo and inscribed 'NATIONAL SERVICE'; the reverse impressed with maker's details 'Butler B'Ham' and official issue number '1706'. Good condition, complete with original buttonhole lapel fitting, enamel intact but with surface scatches. Width 30mm. Dennis Brothers Limited was an manufacturer of commercial vehicles such as buses, fire engines and lorries and trucks, they were based in Guildford, Surrey.