36th International Auction- part 2- philately & picture postcards

1877, ROUSTSCHUK in blue, in compliant with 1875 rate schedule, 1875 issue 20p. green and 1870 issue two single 2pia. brown on registered cover tied by "RUSCUK 81" (AP Type 04, no.5,R) circular type all arabic cancellation and blue all arabic registration mark "taahhüt olunmusdur" alongside, addressed to Istanbul with arrival mark on reverse, tiny border crease, extremely scarce early registered mail, showpiece!