Sale #44 Asia, Europe, incl. Special Auction British Africa

Raketenpost: 1935 (21.3.) K. Roberti-Netherlands: Two different covers flown by rockets "Mars" and "
1935 (21.3.) K. Roberti-Netherlands: Two different covers flown by rockets "Mars" and "Mercurius", both with the respective vignette in combination (variety) with the green vignette printed for the later (23. April) start of the parachute rocket "Neerlandia P.P.1". The cover flown with the "Mars" bearing both vignettes perforated while the "Mercurius" cover with the two vignettes imperforated, both with respective frankings, Katwijk aan zee datestamps, cachets and Roberti's signature. The Mars cover creased as usual, the second cover fresh and fine. An unusual pair.
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