Bidspirit auction | Liechtenstein - Air Post stamps

Liechtenstein - Air Post stamps - 1936, Airships ''Hindenburg'' and ''Graf Zeppelin'', 1fr rose carmine and 2fr violet, complete set of two in sheets of 25, folded once along vertical perforation between second and third rows, full OG, NH, VF, C.v. $4,000++, SBK#F14-15, C.v. CHF7,500 as singles, Est. $1,500-$2,000, Sc. #C15-16