Bidspirit auction | Imperial Russia

Imperial Russia - 1857, 10k brown and blue, imperforated single mounted on a piece, nice four-side margins, pen-cross and downward ''Beltsy'' (now city in Moldova, then Jewish town in Bessarab Gub.) pre-philatelic line cancellation, VF, a beautiful and rare item, P. Buchsbayew certificate, Sc. #1