Auction #93 Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World

1940 (March 18-20), First Round Flight registered cover Rome - Locarno - Rome, addressed to Milan, franked by complete set of Pope Pius XII, tied by Vatican City ''18.3.40'' ds, Rome ''19.3.40'' connection and Locarno the same day marking is on front, Rome Posta Aerea ''20.3.40'' and Milan ''21.3.40'' arrival handstamps, minor soiling, still F/VF, 19 items were delivered by this round flight, Est. $150-$200