1923, Airplane surcharge 20k in red on Imperial stamps, complete set of 16, including four imperforated values, practically flawless condition, full or large part of OG, mainly LH, VF and very rare assembly, less than 25 complete sets possible, each stamp expertized by H. Bloch, W. Pohl and others with Friedl certificate for the set, Mi C.v. ?24,200
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