1882 (May 6), 7k. carmine & green, tied by framed oval "R.O.P.I.T. / BURGAS" datestamp in blue (Tchilinghirian = fig. 729) to cover to Constantinople, reverse with next-day "R.O.P.i.T. / CONSTANTINOPLE" arrival datestamp, a remarkably fresh cover of great rarity, very fine
