General Post Office GPO Royal Mail postmans security area badge

A good original post 1979 'General Post Office GPO postmans security badge'; large yellow chromium plated example, wide red enamel band top and bottom, inscribed 'Royal Mail' postmans identification number '111' to centre and area code 'YH' below; the reverse embossed 'A Reward Will Be Given To The Finder Of This Badge On Handing It In At The Nearest Post Office'. Very good condition, complete with two loop fitting bar to reverse together with securing pin, no damage to the enamel.Height approx 45mm.