On those 2 covers posted from France, others country stamps were illegally affixed on, thus leading to the letters being taxed. First letter bears France 1965 EUROPA stamp (0.30c) with a Belgium stamp, and second letter bears 1968 EUROPA stamp (0.30c) with a range of Monaco stamps, both letters were posted under paid to Belgium and were taxed. The word “NUL” was affixed on the illegally used stamps by the French Postal service.
France illegal usage of stamps resulting in letter being taxed…
