Russia, USSR 1934, Mi. 462y - 466y 5k. - 80k. Aircraft ANT-9 Over Furnaces of Donbass, Complete set of 5 values with Watermark:Greek Border and Rosettes [Up]. postmarked.  Mi:SU 462Y- 466Y, Sn:SU C40 - C44, Yt:SU PA41(B) - PA45(B), Sg:SU 643A- 647A,  Cat V. €90.