Minsk, 20 roubles surcharge Surcharged in black on 5 k USSR postal stationary envelopes 20 r on 5 k (1988) Pictures on the envelopes 20 r on 5 k USSR postal stationery envelope Polytechnical Institute 20 r on 5 k USSR postal stationery envelope Birthday! 20 r on 5 k USSR postal stationery envelope Birthday! © Yuri Vasiliev

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