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

CENTENARY ISSUE - ERROR MULTIPLES GROUP: 1916, ½c-24c, over 320 mostly mint stamps in blocks of four or larger, representing perforation and printing varieties, horizontal or vertical Honeycombs watermark, neatly annotated on album pages, approximately a half of blocks representing various pre-printing paper folds, some with gutter at top showing a part of se-tenant stamps, occasional flaws possible, generally F/VF and great unit for a specialist, Est. $300-$400