WW2 Home Guard Home Front Invasion Defence lapel badge

A good original Second World War period small round gilt brass badge inlaid with blue enamel, inscribed 'H.G' to the centre, surmounted by an unusual King's Crown in red enamel. Good condition, complete with original buttonhole fitting, very minor flaws to the enamel. Height 23mm. Formed in 1940, from the recently raised Local Defence Volunteers (LDV), to counter the threat of invasion from German airborne and seaborne troops (Hitler's 'Operation Sea Lion').