| Borisov, 15 kopecks surcharge Surcharged in black on USSR envelopes without imprinted stamp  15 kPictures on the envelopes     15 k on USSR envelope without imprinted stamp Mushrooms (I) 15 k on USSR envelope without imprinted stamp Mushrooms (II) 15 k on USSR envelope without imprinted stamp Mushrooms (III) 15 k on USSR envelope without imprinted stamp Mushrooms (IV) Envelopes without picture 15 k on USSR envelope without imprinted stamp (I) 15 k on USSR envelope without imprinted stamp (II) Double surcharge © Yuri Vasiliev |
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