Canada #468A. CBN "Test Coils". Canadian Bank Note Company 1967 issue test coils in an imperforate strip of four (with DEX gum). These "FOR TESTING PURPOSES ONLY/AUX FINS D'ESSAI” coils were produced for use with the 6c orange Centennial coils to display the new coil dispensers. These test coils have been recently listed in Unitrade. "Must have" items for the Centennial collector. 2014 Unitrade.