This cleverly concealed escape compass is based on a standard battledress belt buckle. The central bar of the buckle has a small sliding metal sleeve over it. When this is moved it reveals/releases a small flat metal compass pointer to one side and a pivoted metal fulcrum to the other. The user would balance the pointer on the fulcrum to create a working compass. When the buckle was attached to the blouse the actual compass was completely hidden from view. This is one of the rarer and more ingenious of the wartime escape compasses that were developed by Clayton Hutton and his team at MI9. Excellent condition. Stock code E17708.