cover 1868 entire from Sistov to Rustchuk bearing 10kr. green with c.d.s.; 1869 entire letter from Sistov to Vienna bearing 10kr. green (corner defect) tied by c.d.s. and oval-framed "AGENTIE/D.D.S.G./SISTOV", also showing "per Damplschiff" h.s.; 1872 entire to Galatz bearing 10kr. green tied by "SISTOV" c.d.s.; all cancellations in blue.