WW2 RCAF Royal Canadian Air Force Escape and Evasion Button Compass

WW2 RCAF Royal Canadian Air Force Escape and Evasion Tunic Button Compass
A very good rare original WW2 issue example appertaining to be an ordinary large brass tunic button. When the base section is unscrewed (obosite thread) opens to reveal a concealed compass. The button with maker’s details of J.R. Gaunt & Son. London.  Complete with shank.