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Knabenportrait Jacob Kochs. Knabenportrait des Jacob Kochs in russischer Kadettenuniform Pastell auf Papier cm cm Aus dem Moskauer Nachlass Jacob Kochs Rittmeister des Zaren Alexander II kunstauktionenduesseldorf de Hargesheimer Gnther Kunstauktionen anonymous PDold Images from Hargesheimer Gnther Kunstauktionen Jacob Kochs