National Democratic Party NDP Battle for Britain political badge circa 1966

A rare original circa 1966 to early 1970's short lived 'National Democratic Party political badge'; small chromium plated example, bearing white enamel title surround 'NDP Battle for Britain', the centre displaying a 'Union Jack Flag'. Very good condition, complete with original pin fittings, no damage to the enamel.
Diameter 20mm.