Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 972:
1917, Prince Johann, unissued 15h deep rose, perforation 12½x13, perfect single in every respect, full original bright gum, NH, VF and very rare, R. Lerch certificate, Scott unlisted, SBK #1A, C.v. CHF2,200, Est. $900-$1,200
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