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

1910-12, Bicentenary of the Poltava Battle, violet diagonal surcharge 1k on 15k violet and gray, three-side margin perforated block of 12 (2x6), stamp on position 7 has no white dot over ''Z'' in ''Zemsk.'' variety, full OG, NH, VF and rare multiple, only 8 stamps with this variety possible, Chuchin #47, var, Schmidt #58, var, C.v. $2,400 as hinged singles, variety is not mentioned in the Cat, Est. $1,500-$2,000