National Union of Mineworkers Nottingham NUM badge

A good original circa 1985 'National Union of Mineworkers Nottingham Area badge'; circular chromium plated example inlaid with red, white, green and black enamel 'NUM' crest to centre, legend below 'Unity is Strength'. Very good condition, complete with original pin fittings with safety roller catch in good working order, enamel perfect. Diameter 25mm.