Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1454:
1918, violet overprint (type 2gg) on 3.50r and 7r, two vertical tete-beche pairs (one stamp has inverted overprint) on vertically laid paper, full OG, LH, VF, ex-Dr. Zelonka, Est. $250-$300 , Bulat #508-09 var
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