vikantiq,
Well first of all be exactly sure that it Karahan. Judging by the manner of painting I am not quite sure, because not seen in N. Karahan broad strokes. Signed on the back may not be the author. But in general Karahan sketches (and pictures) sometimes do not sign. At the auction Sovkom this year has been sold to my sketch Karahan, also unsigned for 50000 rub.
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