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Pioneer Rocket Mail Karl Roberti (1934/35): Group of 18 signed covers, starting with 1934 (Dec. 6) Meteoor P.9, Poolster P.12 (2), Mars P.13 (4 of which three with imperf. labels), Venus OP.15), Icarus R.V.1 (perf./imperf.), Santos Dumont R.V.2, Neerlandia P.P.1 (3), Luxemburgia R.Kr.1, Belgica (2), Jupiter P.26 and Albertine R.V.8, all fine Ellington Zwisler = US$ 5'500.
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