- Scott Catalog # : 909 - 920 / Ioor Cachet First Day Covers.
- Set Includes: 909 Poland / 910 Czechoslovakia / 911 Norway / 912 Luxembourg / 913 Netherlands / 914 Belgium / 915 France / 916 Greece / 917 Yugoslavia / 918 Albania / 919 Austria and 920 Denmark.
- NOTE: The 913 Netherlands is hand addressed to T. Ioor. Travilla Ioor which was Henry's sister. She took over the cover design after his death in 1940.
- The flaps are sealed and there is no gum yellowing.
- MINOR FLAWS AS EXPECTED FOR 80 PLUS YEAR OLD FDCs, BUT ARE IN FINE, TYPED ADDRESSED AND ONE HAND ADDRESSED CONDITION.