Lot 1031
1913 (31. Aug.) Flugtag Grenchen, offizielle Karte Nr. 4 (Th. Borrer, mit zweipl. MONOPLAN Ponnier-Hanriot, Gnome Motot, 80HP., Sauser-Kerzen, Bosch-Magnet) nach Solothurn, mit Tellknabe 5C frankiert und mit blauem GRENCHEN-SOLOTHURN Stempel, wesentlich seltener als der violette, signiert vom Theodor Borrer, Attest Bohler (1990)Journée d’aviation à Granges, carte officielle N°4 affranchie avec fils de Tell 5c et oblitéré du cachet GRENCHEN- SOLOTHURN en bleu – nettement plus rare que le violet, signée par le pilote Borrer, rare, cert. Bohler (1990)
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