A pair of black painted metal fly buttons as used on R.A.F. battledress trousers etc. Designed by Christopher Clayton Hutton at MI9 and designated as the 'Swinger, Type No.6' one button has a small 'spike' in the centre on which the second magnetised button can be balanced. Small luminous dots on this button indicate North & South. Issued to aircrews to aid escape and evasion. Excellent working condition. Stock code E24307.