1924, not issued airmail stamp: 10 Kop. On 5 Rouble, type II, in perfect condition mint never hinged, very rare stamp, expertized Soviet philatelist association and expertise Hovest VP (2016) : "excellent condition. ", Michel 1.500.- - 2016 obtained we during of our 153. Auction for a piece in same quality 750.- Euro+percentage of bid price!