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

1931 (July 9-10), FFC Rome - Athens - Thessaloniki, mixed franking of Vatican City 25c dark blue on light blue network and Italy 50c dark brown in block of four, cancelled by Vatican ''8.7.31'' and Rome ''9.7.31'' ds, arrival and transit markings, mostly VF and rare, only 22 items carried, Est. $250-$300